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    Compressed timeline of recent experience in monkey lateral prefrontal cortex

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    Date Issued
    2018-07-01
    Publisher Version
    10.1162/jocn_a_01273
    Author(s)
    Tiganj, Zoran
    Cromer, Jason A.
    Roy, Jefferson E.
    Miller, Earl K.
    Howard, Marc W.
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    Permanent Link
    https://hdl.handle.net/2144/38213
    Version
    Accepted manuscript
    Citation (published version)
    Zoran Tiganj, Jason A Cromer, Jefferson E Roy, Earl K Miller, Marc W Howard. 2018. "Compressed Timeline of Recent Experience in Monkey Lateral Prefrontal Cortex." JOURNAL OF COGNITIVE NEUROSCIENCE, Volume 30, Issue 7, pp. 935 - 950 (16). https://doi.org/10.1162/jocn_a_01273
    Abstract
    Cognitive theories suggest that working memory maintains not only the identity of recently presented stimuli but also a sense of the elapsed time since the stimuli were presented. Previous studies of the neural underpinnings of working memory have focused on sustained firing, which can account for maintenance of the stimulus identity, but not for representation of the elapsed time. We analyzed single-unit recordings from the lateral prefrontal cortex of macaque monkeys during performance of a delayed match-to-category task. Each sample stimulus triggered a consistent sequence of neurons, with each neuron in the sequence firing during a circumscribed period. These sequences of neurons encoded both stimulus identity and elapsed time. The encoding of elapsed time became less precise as the sample stimulus receded into the past. These findings suggest that working memory includes a compressed timeline of what happened when, consistent with long-standing cognitive theories of human memory.
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    • CAS: Psychological and Brain Sciences: Scholarly Papers [262]
    • BU Open Access Articles [4833]


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