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Electrophysiological Signals of Familiarity and Recency in the Infant Brain.
- Source :
- Infancy; Sep/Oct2010, Vol. 15 Issue 5, p487-516, 30p, 5 Color Photographs, 1 Diagram
- Publication Year :
- 2010
-
Abstract
- Electrophysiological work in nonhuman primates has established the existence of multiple types of signals in the temporal lobe that contribute to recognition memory, including information regarding a stimulus's relative novelty, familiarity, and recency of occurrence. We used high-density event-related potentials (ERPs) to examine whether young infants represent these distinct types of information about previously experienced items. Twenty-four different highly familiar and initially novel items were each repeated exactly once either immediately ( Experiment 1 ), or following one intervening item ( Experiment 2 ). A late slow wave (LSW) component of the ERP exhibited neural responses consistent with recency signals over right-central leads, but only when there were no intervening stimuli between repetitions. The LSW also exhibited responses consistent with familiarity signals over anterior-temporal leads, but only when there were intervening stimuli between repetitions. A mid-latency negative component (i.e., the Nc) also distinguished familiar from novel items, but did not exhibit a pattern of responding consistent with familiarity signals. These findings suggest that infants encode information about a variety of objects from their natural environments into long-term memory, and can discriminate between familiar and unfamiliar items, and between recently seen and new items, very quickly (within 1 sec). They also suggest that infants represent information about not only whether a stimulus is familiar or unfamiliar but also whether it has been seen recently. [ABSTRACT FROM AUTHOR]
- Subjects :
- BRAIN physiology
ANALYSIS of variance
COMPUTERS
CORNEA
DATABASES
ELECTRODES
ELECTROENCEPHALOGRAPHY
ELECTROPHYSIOLOGY
EXPERIMENTAL design
HUMAN information processing
MEMORY
PHOTOGRAPHY
RESEARCH funding
STATISTICAL hypothesis testing
STATISTICS
T-test (Statistics)
TEMPORAL lobe
DATA analysis
EFFECT sizes (Statistics)
WAVE analysis
REPEATED measures design
HUMAN research subjects
PATIENT selection
CHILDREN
Subjects
Details
- Language :
- English
- ISSN :
- 15250008
- Volume :
- 15
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Infancy
- Publication Type :
- Academic Journal
- Accession number :
- 53951205
- Full Text :
- https://doi.org/10.1111/j.1532-7078.2009.00021.x