Heterogeneous attractor cell assemblies for motor planning in premotor cortex

Maurizio Mattia, Pierpaolo Pani, Giovanni Mirabella, Stefania Costa, Paolo Del Giudice, Stefano Ferraina

Research output: Contribution to journalArticle

Abstract

Cognitive functions like motor planning rely on the concerted activity of multiple neuronal assemblies underlying still elusive computational strategies. During reaching tasks, we observed stereotyped sudden transitions (STs) between low and high multiunit activity of monkey dorsal premotor cortex (PMd) predicting forthcoming actions on a single-trial basis. Occurrence of STs was observed even when movement was delayed or successfully canceled after a stop signal, excluding a mere substrate of the motor execution.Anattractor model accounts for upward STs and high-frequency modulations of field potentials, indicative of local synaptic reverberation.Wefound in vivo compelling evidence that motor plans in PMd emerge from the coactivation of such attractor modules, heterogeneous in the strength of local synaptic self-excitation. Modules with strong coupling early reacted with variable times to weak inputs, priming a chain reaction of both upward and downward STs in other modules. Such web of "flip-flops" rapidly converged to a stereotyped distributed representation of the motor program, as prescribed by the long-standing theory of associative networks.

Original languageEnglish
Pages (from-to)11155-11168
Number of pages14
JournalJournal of Neuroscience
Volume33
Issue number27
DOIs
Publication statusPublished - 2013

ASJC Scopus subject areas

  • Neuroscience(all)

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