Intracranial electroencephalography reveals two distinct similarity effects during item recognition.
Behavioral studies of visual recognition memory indicate that old/new decisions reflect both the similarity of the probe to the studied items (probe-item similarity) and the similarities among the studied items themselves (list homogeneity). Recording intracranial electroencephalography from 1,155 electrodes across 15 patients, we examined the oscillatory correlates of probe-item similarity and homogeneity effects in short-term recognition memory for synthetic faces. Frontal areas show increases in low-frequency oscillations with both probe-item and item-item similarity, whereas temporal lobe areas show distinct oscillatory correlates for probe-item similarity and homogeneity in the gamma band. We discuss these frontal low-frequency effects and the dissociation in the temporal lobe in terms of recent computational models of visual recognition memory.
van Vugt
Marieke K
MK
Center for the Study of Brain, Mind and Behavior, Green Hall Princeton University, Princeton, NJ 08540, USA. mkvan@princeton.edu
Schulze-Bonhage
Andreas
A
Sekuler
Robert
R
Litt
Brian
B
Brandt
Armin
A
Baltuch
Gordon
G
Kahana
Michael J
MJ
D000293:Adolescent; D000328:Adult; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology*; D011939:Mental Recall / Q000502:physiology; D008875:Middle Aged; D008959:Models, Neurological; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010507:Periodicity; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D021641:Recognition, Psychology / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted