Both groups showed a significant novelty preference only for the no-delay condition. On day
two, event-related potentials (ERPs) were recorded while infants viewed the VPC familiar face, a more recently familiarized face, and a novel face, and mean amplitude for components thought to reflect memory (positive slow wave, PSW) and attention (negative central, Nc) were computed. In temporal regions, HII showed a diminished Nc and enhanced PSW to the recently familiarized face, while CON showed a similar trend for the PSW only. Overall, infants showed the largest PSW over left scalp regions. Finally, a positive correlation between VPC novelty preference after 24 h and PSW was found in CON, and preliminary results suggest that this association differs as a function of group. Therefore, selleck inhibitor in comparison with CON, HII showed both similarities and differences on individual
tasks of memory as well as potentially disparate relations between the www.selleckchem.com/products/epacadostat-incb024360.html behavioral and neural mechanisms underlying memory performance. The capacity to transform a new experience into a lasting memory is essential to human learning and development. The study of memory in infants can provide an early window into this process of cognitive development. Although infants are nonverbal, their memory can be evaluated through the use of both behavioral and electrophysiological measures. Visual paired comparison (VPC) is the behavioral task that is most often used to evaluate nonverbal visual recognition memory in infants. This task involves familiarizing the infant to a visual stimulus for a fixed period of time and subsequently testing the infant by showing the familiarized stimulus next to a novel stimulus such that the infant simultaneously PJ34 HCl views both the familiar and novel stimuli. Memory is inferred if the infant
shows preferential looking, greater than is expected by chance, to one stimulus over the other, typically a preference toward the novel stimulus (Bauer, San Souci, & Pathman, 2010). Prior studies have used the VPC task to demonstrate visual recognition memory across time delays at various infant ages. Geva, Gardner and Karmel (1999) demonstrated novelty preference after a short delay in 4-month-olds, Pascalis, de Haan, Nelson and de Schonen (1998) demonstrated novelty preference after a 24-h delay in 6-month-olds, and Morgan and Hayne (2011) demonstrated novelty preference in 12-month-olds when tested immediately but not after 24-h delay. Through use of the VPC task, all of these studies demonstrated the presence of visual recognition memory in infants from ages 4 to 12 months, and although the overall trend is toward retention over progressively longer time delays after shorter periods of familiarization with increasing age, the precise retention intervals at various ages during infancy remain to be identified (Rose, Feldman, & Jankowski, 2004).