Heterogeneous Redistribution of Facial Subcategory Information Within and Outside the Face-Selective Domain in Primate Inferior Temporal Cortex

The inferior temporal cortex (ITC) contains neurons selective to multiple levels of visual categories. However, the mechanisms
by which these neurons collectively construct hierarchical category percepts remain unclear. By comparing decoding accuracy
with simultaneously acquired electrocorticogram (ECoG), local field potentials (LFPs), and multi-unit activity in the macaque
ITC, we show that low-frequency LFPs/ECoG in the early evoked visual response phase contain sufficient coarse category (e.g.,
face) information, which is homogeneous and enhanced by spatial summation of up to several millimeters. Late-induced highfrequency
LFPs additionally carry spike-coupled finer category (e.g., species, view, and identity of the face) information, which is
heterogeneous and reduced by spatial summation. Face-encoding neural activity forms a cluster in similar cortical locations
regardless of whether it is defined by early evoked low-frequency signals or late-induced high-gamma signals. By contrast,
facial subcategory-encoding activity is distributed, not confined to the face cluster, and dynamically increases its heterogeneity
from the early evoked to late-induced phases. These findings support a view that, in contrast to the homogeneous and static
coarse category-encoding neural cluster, finer category-encoding clusters are heterogeneously distributed even outside their
parent category cluster and dynamically increase heterogeneity along with the local cortical processing in the ITC.

書誌情報

Cerebral Cortex

巻 28, 号 4, p. 1416-1431, 発行日 2018-01

出版者

Oxford University Press

ISSN

収録物識別子タイプ

ISSN

収録物識別子

1047-3211

PubMed番号

識別子タイプ

PMID

Versions

Ver.1

2023-05-15 23:24:58.574430

Show All versions

Cite as

エクスポート

OAI-PMH

JPCOAR 2.0
JPCOAR 1.0
DublinCore
DDI

Other Formats

JSON
BIBTEX

インデックスリンク

インデックスツリー

アイテム