THERE is an accumulating body of literature describing sensory processing as an important factor in human behavior. Researchers describe 4 patterns of sensory processing that occur across all age groups, and seem to occur more intensely in vulnerable populations. Early intervention professionals and families need to have a working knowledge about sensory processing so that they can interpret children's behaviors from a sensory processing perspective. Professionals and caregivers can also use sensory processing knowledge to understand their own responses to events in everyday life. Sensory processing knowledge is useful for planning interventions that support children to have successful and satisfying experiences in everyday life.
This article has 3 parts. First, there is a review of Dunn's model of sensory processing, and a summary of the evidence that validates this model. Second, the article presents behavior patterns that would be associated with the 4 patterns of sensory processing in Dunn's model. Finally, there is a discussion about how to apply sensory processing to intervention planning within natural environments.
DUNN'S MODEL OF SENSORY PROCESSING
On the basis of data from more than 1000 children with and without disabilities, Dunn (1997) hypothesized that there is a relationship between a person's nervous system operations and self-regulation strategies, and that the interaction of these functions creates 4 basic patterns of sensory processing. After making these initial hypotheses, Dunn and colleagues (Brown, Tollefson, Dunn, Cromwell, & Filion, 2001; Brown, Cromwell, Filion, Dunn, & Tollefson, 2002; Dunn & Bennett, 2002; Dunn & Daniels, 2001; Dunn, Myles, & Orr, 2002; Dunn & Westman, 1997; Ermer & Dunn, 1998; Kientz & Dunn, 1997; McIntosh, Miller, Shyu, & Hagerman, 1999; McIntosh, Miller, Shyu, & Dunn, 1999) tested these hypotheses about basic patterns of sensory processing with other age groups and in groups with and without specific disabilities. What they found is that these patterns of sensory processing occur in each age group from infancy to older adulthood, and that people with disabilities including autism, attention-deficit/hyperactivity disorder (ADHD), schizophrenia, Asperger syndrome, and developmental and learning disabilities have both distinctive and more intense patterns of sensory processing than do their peers without disabilities.
Neurological thresholds are an important nervous system construct for understanding sensory processing. A “threshold” is the point at which there is enough input to cause a nerve cell or a system to activate. When a stimulus is strong enough to trigger the threshold, it causes activation (ie, you notice it) (Kandel, Schwartz, & Jessell, 2000). Thresholds are on a continuum; when a person has low sensory thresholds, this means that the person will notice and respond to stimuli quite often because the system readily activates to those sensory events. When a person has high thresholds, this means that the person will miss stimuli that others notice easily because the system needs stronger stimuli to activate. Each person has a personal range of thresholds for noticing and responding to sensory events in everyday life and these thresholds may be different for each type of sensory input. For example, a person may easily notice noises (eg, low threshold for sounds) but may not notice other stimuli very easily, such as touch (eg, may have a high threshold touch) (Dunn, 1997).
A second construct that is important to understand is self-regulation, a behavioral construct that is also on a continuum. At one end of the continuum, persons have a passive strategy; they let things happen around them, and then react. For example, a child may continue to sit amidst other children during play and become irritable because of all the random sounds in the play area. It is a passive self-regulation strategy to remain in this noisy play area even when the child feels uncomfortable from all the sounds. At the other end of the continuum, persons utilize an active strategy; they tend to do things to control the amount and type of input that is available to them. For example, the same child playing amidst other children would crawl to a quieter place when the sound got overwhelming. It is an active self-regulation strategy to adjust one's position to get a more manageable amount of sensory input.
When these 2 continua intersect, 4 basic patterns of sensory processing emerge. Figure 1 provides a diagram summarizing the relationship among the thresholds, self-regulation, and sensory processing patterns. Each pattern is unique, and represents one extreme of the threshold and self-regulation continua (Dunn, 1997, 2001). The 4 patterns that result are (a) sensation seeking, which represents high thresholds and an active self-regulation strategy; (b) sensation avoiding, which includes low thresholds and an active self-regulation strategy; (c) sensory sensitivity, which includes low thresholds and a passive self-regulation strategy; and (d) low registration, which represents a high threshold and a passive self-regulation strategy. It is helpful to understand the functional characteristics of each pattern.
Before discussing each specific pattern, it is important to note that no one has only one pattern of sensory processing. When considering the different sensory systems, a person might have sensitivity for touch but have low registration for sounds. When one recognizes the details of children's patterns, this detail enables parents, teachers, and other care providers to tailor experiences and environments to meet children's precise sensory processing needs. When meeting specific needs, children have more opportunities for participating successfully.
In addition, remember that these patterns of sensory processing are characteristic of every human being's experience in daily life. Therefore, adults who interact with children need to understand their own sensory processing needs as well. If a parent has sensory sensitivity for touch and has a child who seeks touch, they will need to negotiate their interactions so that the parent does not get overwhelmed and the child get these needs met.
When persons have a sensation-seeking sensory processing pattern, they derive pleasure from sensations in everyday life. Although they have high sensory thresholds, which means that they do not notice stimuli easily, their interest in creating sensory experiences for themselves (ie, the active self-regulation strategy) enables them to meet their own high thresholds, and therefore respond to the world around them. It is easy to determine which sensations are of interest by watching behavior; children interested in tactile input will touch everything, as if they are mapping the world around them with their hands and skin. Children interested in auditory input will make sounds with their mouths, or other objects during the day. An adult who has a seeking pattern may want to participate with the children in physical play rather than direct children to play areas, or may be very verbal in describing objects and activities to the children.
When persons have a sensation avoiding pattern, they tend to withdraw from situations very quickly. This person's thresholds are met very quickly with very little input, and more input can be overwhelming, as if the nervous system cannot handle more information. Sensation avoiding is an active self-regulation strategy for controlling input; but since these persons have low sensory thresholds (ie, notice sensory stimuli easily), their withdrawal strategy serves to limit sensory input rather than get more input like a person with sensation seeking would. Children might withdraw by moving away from noisy spaces, getting out of crowded rooms in which they are being touched a lot, or may be very picky eaters. Remember that withdrawing is an adaptive strategy the child uses to handle too much input. Adults who have a sensation avoiding pattern may create independent play options with toys that interact with the child, or may design more contained areas for play to restrict sound and visible clutter.
When persons have a sensory sensitivity pattern, they tend to be reactive in situations. They have high detection skills (due to low thresholds), and so they notice many things in the environment. Rather than withdraw from all these stimuli (as a person who avoids sensation would), persons with sensitivity take the more passive self-regulation approach of staying in situations and reacting to what is happening. Children with sensitivity may be irritable, short-tempered, or demanding. Children with sensitivity to sounds may cover their ears or tell others to be quiet; children with sensitivity to movement may be hard to carry because they react to every bump in the road. They may also be hard to hold because of their constant fidgeting. Adults with sensitivity may ask other parents or a teacher's aide to set up the materials for activities that are messy (eg, finger painting, cooking, snack time). This adult may lead these activities but keep a damp cloth handy to keep hands from accumulating the paints or foods.
When persons have a low registration pattern of sensory processing, they fail to notice what other people notice readily because of their high thresholds. Because they also use passive self-regulation strategies, they miss things, and do nothing to capture additional input. Parents and teachers may have to speak and touch this child to get the child's attention. Children may seem oblivious to their environments and may seem unresponsive or flat in situations where others are exhibiting emotions. Adults who have low registration may find themselves in a more chaotic play or meal situation because they are not aware of all the things going on during these activities. These adults may also appear to be more easy going with children, but may also miss early signs of distress or danger, and may need support from other adults to monitor more risky situations.
Most children and adults have more moderate responses to sensory events in everyday life, and therefore sensory processing patterns support their participation. When responses are more extreme, then sensory processing is more likely to interfere with daily life.
EVIDENCE SUPPORTING DUNN'S MODEL OF SENSORY PROCESSING
Over the last decade, researchers have tested the validity and reliability of Dunn's model of sensory processing by conducting studies of children and adults with and without disabilities across the lifespan using 3 age-appropriate questionnaires (ie, the Infant/Toddler Sensory Profile, the Sensory Profile, and the Adolescent/Adult Sensory Profile) (Brown & Dunn, 2002; Dunn, 1999, 2002). Each of the questionnaires contains statements about how a person might respond to a sensory event in everyday life, and the respondent records how frequently that behavior occurs using a 5-point Likert-type scale (ie, never, seldom, occasionally, frequently, and always). For the children, caregivers complete the questionnaire, whereas the adolescents and adults complete their own questionnaire. Examples of items across the lifespan address similar behaviors that are age relevant. The infant/toddler version includes “My child is distracted and/or has difficulty eating in noisy environments,” the children's version includes “can't work with background noise (eg, fan, refrigerator),” and the adolescent and adult version includes “I find it difficult to work with background noise (eg, fan, radio).” Examiners using these measures can obtain summary scores reflecting the 4 patterns of sensory processing from Dunn's model, and indications about how specific sensory systems might be responding as well.
To evaluate the validity of the concepts from Dunn's model of sensory processing, researchers tested national samples of infants and toddlers (n = 589) (Dunn, 2002; Dunn & Daniels, 2001), children (n = 1115) (Dunn, 1999; Dunn & Westman, 1997), and adolescents and adults (n = 950) (Brown & Dunn, 2002; Brown et al., 2001), and in every age group, researchers verified the existence of the 4 patterns of sensory processing hypothesized in Dunn's model of sensory processing (Dunn, 1997). The data from the national samples of children and adults without disabilities are distributed on the bell curve, suggesting that although most people have moderate responses to sensory events in everyday life, some people without disabilities have intense responses just like cohorts with disabilities.
Studies have reported that persons with various disabilities, including autism, Asperger syndrome, developmental disability, attention deficit hyperactivity disorder, learning disabilities, Fragile X syndrome, and schizophrenia, have significantly different patterns of sensory processing when compared with peers without disabilities (Baranek, Foster, & Berkson, 1997; Brown et al., 2002; Cermak & Daunhaur, 1997; Dove, 2003; Dunn, 2002; Dunn & Bennett, 2002; Dunn et al., 2002; Ermer & Dunn, 1998; Kientz & Dunn, 1997; McIntosh, Miller, Shyu, & Dunn, 1999; Myles et al., 2004; Pohl, Dunn, & Brown, 2001; Rogers, Hepburn, & Wehner, 2003; Watling, Dietz, & White, 2001). Specifically, children and adults in these disability groups have more intense responses than do most of their cohorts without disabilities. In addition, persons in various disability groups have distinct patterns of sensory processing when compared with each other.
Other researchers have reported significant differences in Sensory Profile scores for children with normal and abnormal skin conductance responses (McIntosh, Miller, Shyu, & Dunn, 1999; McIntosh, Miller, Shyu, & Hagerman, 1999; Schaaf, Miller, Sewell, & O'Keefe, 2003). Young adults with distinct patterns of sensory processing (ie, seeking, avoiding, sensitivity, and registration) also had distinct reaction patterns on skin conductance measures (Brown et al., 2002). Studies such as these demonstrate that the Sensory Profile measures may reflect nervous system responses. If studies can verify that these relationships exist, then questionnaires such as the Sensory Profile measures can serve as a proxy for inferring nervous system activity.
SENSORY PROCESSING AS PART OF EVERYDAY LIFE
Research summarized above suggests that there are patterns of sensory processing that can be identified in systematic ways. For those who serve vulnerable children (such as those tested in research studies reported above) and their families, it is important to link patterns of sensory processing to everyday life behaviors as part of assessment; the relationship between sensory processing and everyday life informs intervention possibilities.
Everyone has an individualized pattern of sensory processing
Everyone, including children, their parents, and teachers, have particular ways of responding to sensory events in everyday life. Sensory input from the environment and from the body itself provide information the brain uses to understand experiences and organize responses. People's responses to sensory experiences in everyday life are distributed along a bell curve continuum, with most people responding moderately to sensory experiences, and a few people responding intensely (Brown & Dunn, 2002; Dunn, 1999, 2001). The bell curve distribution is based on the mean and standard deviation of a population, and places about 2% to 4% of people more than 2 standard deviations from the mean. This means that of 100 people, about 2 to 4 of them will significantly respond more intensely to sensory experiences than do their peers (Portney & Watkins, 2000). Therefore, a small number of children and adults in the typical population are responding more intensely to sensory experiences in everyday life. Although it is more common for people in the disability groups tested to respond intensely, intense responses are not reserved for those who have disabilities. Therefore, it is not these intense sensory processing patterns that matter; what matters is how that pattern affects the person's ability to participate in everyday life.
For example, a person may have intense reactions to sounds that make it difficult to concentrate on a conversation when other activities are going on in the home. This person may create a quiet home space for conversation, so the person can get away from the bustle of the kitchen or play areas. Family members will learn that this quiet space is where they need to go to have this family member's attention. When people understand their own and their children's sensory processing patterns, then they can create life routines that are consistent with sensory processing patterns, and thereby support successful participation.
Sensory processing occurs within everyday life
There has been a lot of discussion in the early intervention literature about providing intervention in natural contexts (eg, Dunst & Bruder, 2002; Dunst et al., 2001; Dunst, Hambay, Trivette, Raab, & Bruder, 2000; Dunst & Raab, 2004). There is additional evidence to suggest that applying sensory processing concepts in natural environments is effective (Baranek, 2002; Schneck, 2001). Baranek (2002) reviewed the literature regarding sensory integrative interventions for children with autism, and reported that in order to support generalization of skills, interventions needed to be part of the natural context. Hanft and Pilkington Ovland (2000) discuss the benefits of providing services in natural environments and offer strategies for making therapy services effective within the children's daily life.
Recent studies focus on applying sensory processing knowledge to improve children's focused behavior in the daily life setting of school. Touch pressure (ie, firm touch on the surface of the skin) and proprioception (ie, sense of where joints and muscles are in space) are sensations that provide organized, calming input to the nervous system (Kandel et al., 2000). Using weighted vests as an application of touch pressure and proprioception, researchers hypothesized that providing an intense amount of this input would help children focus and organize themselves for work at school.
In one study of preschoolers with pervasive developmental disabilities and another study of school-aged children with ADHD, researchers reported on the use of weighted vests to improve children's attention, decrease their negative behaviors, and increase their work productivity (Fertel Daly, Bedell, & Hinojosa, 2001; VandenBerg, 2001). They used a reversal design to show that children did better when using the weighted vests. Applying similar concepts, Schilling, Washington, Billingsley, and Deitz (2003) asked children to sit on a ball chair as they completed seatwork in the classroom. The ball chair provides continuous feedback for children's postural control systems because the ball adjusts with the children as they make even small adjustments in their bodies while working. A traditional chair does not provide this feedback, so children can have a tendency to move their bodies more to activate themselves. Although they were targeting children with ADHD, all the children in the classroom alternately (for 3 weeks each) sat on regular chairs and ball chairs (12 weeks total). The children with ADHD improved in their seating behavior and work productivity, and the other children and the teacher indicated they felt more productive when using the ball chairs (Schilling et al., 2003).
Generalizing from this work, in the examples below, sensory experiences are imbedded within daily life routines. In this paradigm, therapists consult with families and teachers to identify the routines that are challenging, and then construct strategies to adjust the routines so that the children can get their sensory processing needs met while continuing to participate in their life activities. In this way, the focus of intervention remains on the children's life activities, and the sensory processing knowledge is a tool for constructing effective strategies within the life routines. In addition, families can implement these strategies as part of their family routines with children who have intense sensory responses and who are not part of the early intervention service system.
Vulnerable children are more likely to have extreme patterns of sensory processing that interfere with everyday life
As summarized above, the evidence accumulated thus far suggests that vulnerable children (eg, children with autism, ADHD, Asperger syndrome, Fragile X syndrome) are much more likely to have intense sensory response patterns. For example, children with autism spectrum disorders have a pattern of significantly different registration combined with avoiding (Dunn, 2002; Myles et al., 2004). With this pattern, these children may fail to notice stimuli (difficulty with registering), and then when the sensory input is strong enough for them to notice, they quickly withdraw (demonstrating avoiding). This pattern would make it very challenging for the children to respond appropriately; children have to sustain their attention to a stimulus in order to learn.
When intense sensory responses are combined with other characteristics of particular disabilities (eg, communication challenges in autism), adaptive responses in everyday life can be challenging. When providers and families can understand the meaning of the children's behaviors from a sensory processing perspective, then they can create a more “sensory friendly” environment for them, thus increasing the chances for the children to manage more situations successfully.
UNDERSTANDING HOW TO EMPLOY SENSORY PROCESSING KNOWLEDGE TO AFFECT EVERYDAY LIFE
Since each of the patterns of sensory processing represents a particular way of responding, it is important to review the responses one might expect, and provide some ideas about how to create a more successful sensory context for the children. This includes considering the best fit between the children and their caregivers; all interactions create sensory experiences for both parties. Balancing everyone's needs leads to more successful interactions, and therefore better intervention outcomes for the children.
Occupational therapists are the most likely to serve as the “therapist” in the vignettes below because sensory processing is part of the core knowledge in this profession's education. The vignettes illustrate functional assessment strategies within the child's natural context combined with standardized assessment to verify impressions; the ability to make these interpretations and recommendations is built on specialized expertise typically provided by occupational therapists. Specialized knowledge also includes the ability to detect signs of overload, and the ability to adjust intensity based on skilled observation during the activity. Tables 1–4 provide ideas for applying sensory processing knowledge to support children in everyday life. Consultation with occupational therapists provides a means for crafting effective individualized intervention ideas for everyday life settings.
More intense responses in registration
When children have a more intense response in low registration, this means that they miss more cues than others (ie, they fail to notice things). Because these children notice less, one might observe that they are more easy going than other children, and are undisturbed by things that others in the family or classroom notice. However, not noticing can also mean that children do not respond when called, may drift away during activities, and have a harder time getting tasks
completed in a timely manner. In general, these children can profit from adults providing more intense sensory experiences that are naturally integrated into the routines of their daily life. With more intensity of sensory input, these children can pay attention for a longer time during daily life activities. Table 1 provides some ideas for enhancing the sensory experiences during daily life activities.
Let us consider an example. Rondina is a 24-month-old girl whose mother is frustrated with getting Rondina awake and dressed in the morning. Mother has to make several attempts to get Rondina awake, and because Rondina is not alert, she does not actively participate in getting her clothing on. Mother knows that Rondina can manipulate her clothing, because she can put her jacket on and undress at other times of the day. As a result of parent interviews, skilled observation during the morning routine and based on the Infant/Toddler Sensory Profile data, the therapist determined that Rondina was missing a lot of cues in her environment (ie, was experiencing low registration).
Using Table 1 as a guide, the therapist prepared some suggestions. Mother was already jostling Rondina to wake her. During the next visit, which was during Rondina's wake-up time, they tried some of the suggestions. They opened Rondina's shades and turned on the radio. This improved the situation some, so the therapist then made a list of additional strategies mother could try, including rubbing scented lotions on Rondina as part of getting up and selecting brightly colored and textured clothing. With the therapist's help, they also moved underwear, socks, and shoes to separate locations around the room; mother asked Rondina to collect these clothing items as a strategy to increase movement (and alertness) during the morning routine.
More intense responses in seeking
When children have a more intense response in sensation seeking, this means that they enjoy sensory experiences and need more sensory input. Because these children enjoy sensory input, one might notice that they move more, hum, or rub their hands on things throughout the day. These children might also point out interesting sensory events throughout the day. The children's interest and pleasure with sensory events might also lead to difficulties with task completion because they may get distracted with new sensory experiences and lose track of daily life tasks. In general, these children can profit from more opportunities to have sensory experiences as part of daily life so they do not have to stop engaging in daily life to create the extra sensory input they desire. With more opportunities for sensory input, these children can continue to pay attention during daily life activities, and therefore stick with them for a longer time. Table 2 provides some ideas for enhancing the sensory experiences during daily life activities. You will notice that some of the ideas in this table are similar to Table 1; this is because both “low registration” and “sensation seeking” are high threshold patterns, which means that they need a lot of extra input to understand what sensory experiences are occurring.
Let us consider an example. Frank is a 13-month-old boy; his father is having difficulty getting through bath time successfully. Mother and father agree that Frank's father is having trouble keeping himself and Frank focused to get the bath completed satisfactorily. The therapist meets with Frank and his father during bath time, since the father has primary responsibility for this routine. The therapist sees that the father misses cues from Frank to interact and play, and is not thorough in bathing him. Frank has many toys in the tub, and seems to go from one to another. Frank enjoys being in the bath, and is frequently trying to move about in the tub. The Infant/Toddler Sensory Profile data confirm the therapist's hypothesis that Frank is seeking sensations; without some guidance from his father, Frank's seeking behaviors are disorganized, and may be leading to mother's worries that he might be unsafe sometimes. The therapist asks the father to complete the Adolescent/Adult Sensory Profile, and confirms what she has hypothesized, that is, the father's behaviors are consistent with a low registration sensory processing pattern. Frank's father is missing information from Frank.
In this situation, Frank and his father can both do better with more intense, focused sensory input during bathing. The therapist and father make a schedule for the bath-time activities, and place a laminated copy of the schedule on the bath wall. Father will mark off the activities as they complete them during bath time (eg, “have Frank reach for 4 toys,” “wash Frank's legs,” “sing a song with Frank”). Using Tables 1 and 2 as a guide, the therapist brings some scented bath products, soap crayons, and several different textured fabric squares so father and Frank can see what they like best. With additional items to increase the intensity of sensory experiences, and a focused plan for implementing the activities, the father can remain attentive because his thresholds are being met, and Frank also gets more sensory input that is organized to facilitate completing the bath successfully.
More intense responses in avoiding
When children have a more intense response in sensation avoiding, this means that they notice things much more than do others. Because these children notice more, one might observe that they are more isolated than other children, and are anxious more quickly than others in the family or at school. These children may be more interested in being alone or in very quiet places. When environments are too challenging, these children may withdraw, and therefore not get activities completed in daily life. In general, these children will be better able to participate in everyday life activities when there is less sensory input available in the environment. When the environment is “quiet” (ie, less sensory input from key sensory systems for that child), these children can continue daily life activities for a longer time. Table 3 provides some ideas for managing the sensory experiences during daily life activities.
Let us consider an example. Millie is a 30-month-old girl; her parents and day care provider are concerned about Millie's play behaviors. She has the most trouble during open play time at day care; she is hesitant to decide what she wants to do, and does not respond to other children's invitations to play. At home, Millie seems content to play in her room; she has certain toys she plays with repeatedly. Her parents want to make sure that this is OK for a child her age. The therapist visits the day care program during the open playtime, and notices that Millie is quite attentive to the other children, although she does not approach them to play. The day care provider says that Millie has good skills with toys, but does not do well in group play situations. The Infant/Toddler Sensory Profile indicates that Millie tends to avoid sensations, particularly touch and sounds.
The therapist explains that Millie seems to be getting overwhelmed by the myriad of sensations that occur during this open play time; she is exhibiting behaviors that help her manage the amount of sensory input she has to deal with at one time. For example, she can get bumped easily by other children and their toys, so hanging back and watching keeps her from having these unpredictable touch experiences. This is also likely the reason she seems content to play in her room at home; it is quiet and predictable in this contained space so she can concentrate on her playing. These explanations help allay the parents' and providers' fears about why Millie is not choosing group play options. With everyone understanding the meaning of Millie's behaviors, the therapist uses Table 3 to generate some additional ideas. They agree to identify a visually accessible but separated play space for Millie at day care. This way, she can still keep track of what is going on, without encountering more sensory input than she can handle. Parents identify some structured play options that take advantage of her visual system strength and reduce the possibility of additional auditory and touch input. For example, they create a corner of the dining room for puzzle making; Millie sits with her back to the wall and facing outward, with the table separating her from the rest of the room. These strategies are respectful of Millie's need to limit input and yet know what is going on.
More intense responses in sensitivity
When children have a more intense sensitivity response, this means that they detect sensory events more than others. Because these children detect more, one might observe that they are more easily distracted than other children, and are upset by things that others in the family might not even notice. Children who notice more will pick up more details in life, and may notice changes in setting or mood very quickly. However, noticing more can also mean that children are distractible, and therefore get interrupted from getting tasks completed in a timely manner. In general, these children can profit from more structured patterns of sensory experiences during daily life. With more structure regarding the sensory input that is available, these children can continue to pay attention during daily life activities, and therefore stick with them for a longer time. Table 4 provides some ideas for managing the sensory experiences during daily life activities. You will notice that some of the ideas in this table are similar to Table 3; this is because both “sensation avoiding” and “sensory sensitivity” are low threshold patterns, which means that children may respond to input quickly and can get overwhelmed.
Let us consider an example. Lester is an 8-month-old boy who is a very picky eater. His parents have had a difficult time transitioning him to foods; he squirms, spits, pushes food out with his tongue, and turns away. These are common behaviors for a young child who has sensitivity to sensations, particularly related to the mouth and face. Referring to Table 4 as a guide, there are several strategies to make mealtime more successful as Lester transitions to foods. First, the therapist identifies the characteristics of acceptable foods, including taste, texture, temperature, wetness, color, and density. For a young child like Lester, he is likely to have little experience with solid foods, so the type of nipple on the bottle may also be a consideration. Understanding the characteristics of current meal choices provides a means to introduce a new food substance that has all the characteristics that Lester has accepted in the past, adding one new characteristic. For example, one could add just a little cereal to the milk to change the texture, but keep temperature etc the same. Another option would be to change the color, or add a little sweetness. When a child is sensitive, being systematic is very important. Once the list of preferred characteristics is available, finding other foods (or nutritional additives) that contain those characteristics becomes the strategy for expanding Lester's food repertoire. As Table 4 also indicates, making the mealtime situation comfortable can also make a difference; comfortable and predictable seating without other distractions can keep Lester from becoming overwhelmed and enable him to focus on eating. Having a pleasant calm meal time is just as important for Lester, even if he eats only a few.
These examples of individualized intervention planning in the child's daily routines illustrate the impact that sensory processing knowledge can have on participation. Although there are many ways to interpret children's behaviors, a sensory processing perspective adds helpful information to a comprehensive picture. Since sensory processing knowledge is emerging from research, it also provides a means for designing evidence-based interventions as well.
Sensory processing knowledge has developed more specificity over the last several years. Evidence indicates that both children and adults with and without disabilities exhibit 4 basic patterns of sensory processing as described in Dunn's model (Dunn, 1997). Understanding the 4 basic patterns of sensory processing enables providers to interpret children's behaviors, and therefore tailor activities and interventions to support children to participate in everyday life. Preliminary evidence supports the concept of applying sensory processing knowledge within everyday life; more studies are needed to characterize exactly how this might be done in the most effective manner.
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