Natural grouping of neural responses reveals spatially segregated clusters in prearcuate cortex.
Natural grouping of neural responses reveals spatially segregated clusters in prearcuate cortex.
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DOI:
10.1016/j.neuron.2015.02.014
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发表时间:
2015-03-18
期刊:
影响因子:
16.2
通讯作者:
Newsome, William T.
中科院分区:
文献类型:
--
作者:
Kiani, Roozbeh;Cueva, Christopher J.;Reppas, John B.;Peixoto, Diogo;Ryu, Stephen I.;Newsome, William T.
A fundamental challenge in studying the frontal lobe is to parcellate this cortex into ‘natural’ functional modules despite the absence of topographic maps, which are so helpful in primary sensory areas. Here we show that unsupervised clustering algorithms, applied to 96-channel array recordings from prearcuate gyrus, reveal spatially segregated sub-networks that remain stable across behavioral contexts. Looking for natural groupings of neurons based on response similarities, we discovered that the recorded area includes at least two spatially segregated sub-networks that differentially represent behavioral choice and reaction time. Importantly, these sub-networks are detectable during different behavioral states, and surprisingly, are defined better by ‘common noise’ than task-evoked responses. Our parcellation process works well on ‘spontaneous’ neural activity, and thus bears strong resemblance to the identification of ‘resting state’ networks in fMRI datasets. Our results demonstrate a powerful new tool for identifying cortical sub-networks by objective classification of simultaneously recorded electrophysiological activity.
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