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J Neurophysiol (May 1, 2003). 10.1152/jn.00647.2002
Submitted on Submitted 8 August 2002; accepted in final form 6 January 2003
REPORT
1Department of Physiology, Tohoku University School of Medicine, Sendai 980, Japan; 2The Core Research for Evolutional Science and Technology, Japan Science and Technology Corporation, Kawaguchi 332-0012, Japan
Ninokura, Yoshihisa,
Hajime Mushiake, and
Jun Tanji.
Representation of the Temporal Order of Visual Objects in the
Primate Lateral Prefrontal Cortex. J. Neurophysiol. 89: 2868-2873, 2003. Recollecting a past episode
involves remembering the temporal order of events. We studied cellular
activity in the lateral prefrontal cortex (PFC) of two monkeys that
were required to remember the temporal order in which visual objects
appeared and to reach for each object in the same order after a delay.
Here, we report the cellular activity in the lateral PFC, focusing on
the delay period. We found that 43% of the delay-period activity was
selective for the sequence in which the visual objects were presented
during the cue period. While the majority of cellular activity was
selective for multiple sequences, some cells (31%) were selective for
only one of six sequences. Our findings show that PFC cells are
involved in holding temporal order information when that information is necessary for planning forthcoming motor behavior.
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