Event-related potential measures of 24-hour retention in 5-month-old infants

Author(s): Lykins, M. S.

Journal/Book: Develop Psychol. 1995; 31: 750 First St NE, Washington, DC 20002-4242. Amer Psychological Assoc. 946-957.

Abstract: Two experiments using event-related potentials (ERPs) investigated 24-hr recognition memory in infants. In each, ERPs were recorded to 100 identical stimuli in 5-month-olds. After 24 hr, 50 of these familiar stimuli and 50 novel stimuli were presented. In Experiment 1, the 2 stimuli were a tone and a click. The amplitude of a negative peak (N2; approximate latency = 350 ms) of the auditory ERP was larger on Day 2 for the familiar stimuli compared with ERPs for both Day 1-familiar stimuli and Day 2-novel stimuli. Trial-to-trial latency variability of N2 decreased from Day 1 to Day 2 for the familiar stimuli. In Experiment 2, 2 tones differing only in frequency (pitch) were used. The results replicated those of Experiment 1. In addition, an earlier positive peak (P2; approximate latency = 200 ms) showed larger amplitudes and smaller latency variability to the familiar stimulus on Day 2.

Note: Article DG Thomas, Oklahoma State Univ, Dept Psychol, 215 N Murray Hall, Stillwater, OK 74078 USA

Keyword(s): VISUAL RECOGNITION MEMORY; LATENCY VARIABILITY; N1

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