Cognitive Neuroscience And NeuropsychologyNeural manifestation of cognitive and precognitive mismatch detection in early infancyFriederici, Angela D.CA; Friedrich, Manuela; Weber, Christiane Author Information Max Planck Institute of Cognitive Neuroscience, PO. Box 500 355, 04303 Leipzig, Germany CACorresponding Author Received 14 March 2002 accepted 10 May 2002 Neuroreport: July 19, 2002 - Volume 13 - Issue 10 - p 1251-1254 Buy Abstract We recorded event-related potentials (ERPs) in 2-month-old infants in two different states of alertness: awake and asleep. Syllables varying in vowel duration (long vs short) were presented in an oddball paradigm, known to elicit a mismatch brain response. ERPs of both groups showed a mismatch response reflected in a positivity followed by a frontal negativity. While the positivity was present as a function of the stimulus type (present for long deviants only), the negativity varied as a function of the state of alertness (present for awake infants only). These data indicate a functional separation between precognitive and cognitive aspects of duration mismatch essential for the distinction between long and short vowels during early infancy. © 2002 Lippincott Williams & Wilkins, Inc.