individual differences in infants' recognition of briefly presented visual stimuli

417 INDIVIDUAL DIFFERENCES IN INFANTS’ RECOGNITION OF BRIEFLY PRESENTED VISUAL STIMULI Janet E. Frick and John E. Richards Department of Psychology, University of Georgia, Athens, GA, 30602-3013 Two individual differences -- level of heart period variability and fixation duration -- have been shown to affect infants’ processing of visual stimuli. In addition, these individual differences may be rwd to heart-rate (HR) defined levels of attention, which have-own to affect infant recognition memory. The current study examined the effect of these individual differences on infants’ recognition of briefly presented visual stimuli using a paired-comparison recognition-memory paradigm. A sample of 35 till-term infants were studied longitudinally at 14,20, and 26 weeks of age. Measures of heart period variability were collected from a 5min baseline recording, and “short” and “long” lookers were classified based on their fixation times to a dynamic, interesting visual stimulus. The recognition-memory procedure involved infants being presented relatively brief (6 s) stimuli in six experimental conditions, with delays corresponding to different HR-defined phases of attention, and then being tested for recognition with novel and familiar stimuli presented for 2, 1 O-second comparison trials. Results indicated that longer fixations, higher heart period variability scores, and greater amounts of sustained attention were associated with better recognition memory scores, particularly for older infants. Older infants showed evidence of recognition memory in a greater number of experimental conditions. Baseline measures of heart period variability were positively correlated with both fixation measures and sustained attention measures, indicating that higher levels of heart period variability, longer fixations to dynamic stimuli, and greater levels of sustained attention tend to co-occur. In conjunction with previous research, the current results support the position that individual differences in heart period variability are significantly associated with visual attention. Further, the results enhance previous findings regarding individual differences in fixation measures, suggesting that such individual differences do reflect processes other than speed of information processing.

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417

INDIVIDUAL DIFFERENCES IN INFANTS’ RECOGNITION OF BRIEFLY PRESENTED VISUAL STIMULI

Janet E. Frick and John E. Richards

Department of Psychology, University of Georgia, Athens, GA, 30602-3013

Two individual differences -- level of heart period variability and fixation duration -- have been shown to affect infants’ processing of visual stimuli. In addition, these individual differences may be rwd to heart-rate (HR) defined levels of attention, which have-own to affect infant recognition memory. The current study examined the effect of these individual differences on infants’ recognition of briefly presented visual stimuli using a paired-comparison recognition-memory paradigm.

A sample of 35 till-term infants were studied longitudinally at 14,20, and 26 weeks of age. Measures of heart period variability were collected from a 5min baseline recording, and “short” and “long” lookers were classified based on their fixation times to a dynamic, interesting visual stimulus. The recognition-memory procedure involved infants being presented relatively brief (6 s) stimuli in six experimental conditions, with delays corresponding to different HR-defined phases of attention, and then being tested for recognition with novel and familiar stimuli presented for 2, 1 O-second comparison trials.

Results indicated that longer fixations, higher heart period variability scores, and greater amounts of sustained attention were associated with better recognition memory scores, particularly for older infants. Older infants showed evidence of recognition memory in a greater number of experimental conditions. Baseline measures of heart period variability were positively correlated with both fixation measures and sustained attention measures, indicating that higher levels of heart period variability, longer fixations to dynamic stimuli, and greater levels of sustained attention tend to co-occur. In conjunction with previous research, the current results support the position that individual differences in heart period variability are significantly associated with visual attention. Further, the results enhance previous findings regarding individual differences in fixation measures, suggesting that such individual differences do reflect processes other than speed of information processing.

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