spectrum disorder (ASD) represents a heterogenous cluster of clinical phenotypes that are classically diagnosed by the time of adolescence. The possibility of late-life emergence of ASD has been poorly explored.
To more fully characterize the possibility of late-life emergence of behaviors characteristic of ASD in mild cognitive impairment
and AD, we surveyed caregivers of 142 older persons with cognitive impairment from the University of Kentucky Alzheimer’s Disease Center Longitudinal Cohort using the Gilliam Autism
Participants with high autism
index ratings (autism
“possible/very likely,” n=23) reported significantly (statistically and clinically) younger age at the onset of cognitive impairment than those who scored in the autism
“unlikely” range (n=119): 71.14±10.9 vs. 76.65±8.25 (P
=0.034). In addition, those in the autism
“possible/very likely” group demonstrated advanced severity of cognitive impairment, indicated by the Clinical Dementia
Rating Scale Sum of Boxes scores.
Data demonstrate that ASD behaviors may seem de novo of degenerative dementia
and such behaviors are more prevalent in those with early onset dementia
. Further work elucidating a connection between ASD and dementia
could shed light on subclinical forms of ASD, identify areas of shared neuroanatomic involvement between ASD and dementias, and provide valuable insights that might hasten the development of therapeutic strategies.