Effects of stimulus and laboratory experience on auditory evoked potentials in infancy

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Abstract
This study investigated the possibility of a day‐of‐testing effect occurring when auditory evoked potentials (AEPs) are recorded from young infants (5 to 6 months old). Experimental group infants were brought into the laboratory on Day 1 and AEPs were recorded to tone pips. This procedure was then repeated on the following day. Infants in the control group received the entire experimental procedure on Day 1 but heard no tones. On Day 2, control infants received the tone pips and AEPs were recorded. The results suggest that P2‐N2 is affected both by previous exposure to the laboratory situation and by previous exposure to the auditory stimuli. N2‐P3 appears to be influenced only by previous exposure to the auditory stimuli. These results are discussed with regard to their methodological and theoretical implications.