Partially Mixed Selectivity in Human Posterior Parietal Association Cortex.

Abstract:

:To clarify the organization of motor representations in posterior parietal cortex, we test how three motor variables (body side, body part, cognitive strategy) are coded in the human anterior intraparietal cortex. All tested movements were encoded, arguing against strict anatomical segregation of effectors. Single units coded for diverse conjunctions of variables, with different dimensions anatomically overlapping. Consistent with recent studies, neurons encoding body parts exhibited mixed selectivity. This mixed selectivity resulted in largely orthogonal coding of body parts, which "functionally segregate" the effector responses despite the high degree of anatomical overlap. Body side and strategy were not coded in a mixed manner as effector determined their organization. Mixed coding of some variables over others, what we term "partially mixed coding," argues that the type of functional encoding depends on the compared dimensions. This structure is advantageous for neuroprosthetics, allowing a single array to decode movements of a large extent of the body.

journal_name

Neuron

journal_title

Neuron

authors

Zhang CY,Aflalo T,Revechkis B,Rosario ER,Ouellette D,Pouratian N,Andersen RA

doi

10.1016/j.neuron.2017.06.040

subject

Has Abstract

pub_date

2017-08-02 00:00:00

pages

697-708.e4

issue

3

eissn

0896-6273

issn

1097-4199

pii

S0896-6273(17)30592-5

journal_volume

95

pub_type

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