Título:	Neuronal response sto face-like and facial stimuli in the monkey superior colliculus
Autor(es):	Nguyen, Minh Nui Matsumoto, Jumpei Hori, Etsuro Maior, Rafael Plakoudi Souto Tomaz, Carlos Alberto Bezerra Tran, Anh Hai Ono, Taketoshi Nishijo, Hisao
Assunto:	Colículo superior Macaco Expressão facial
Data de publicação:	17-Mar-2014
Editora:	Frontiers
Referência:	NGUYEN, Minh Nui et al. Neuronal response sto face-like and facial stimuli in the monkey superior colliculus. FrontiersinBehavioralNeuroscience, v. 8, Article 85, 17 mar. 2014. Disponível em: <10.3389/fnbeh.2014.00085>. Acesso em: 4 jul. 2017. doi: 10.3389/fnbeh.2014.00085.
Abstract:	The superficial layers of the superior colliculus (sSC) appear to function as a subcortical visual pathway that bypasses the striate cortex for the rapid processing of coarse facial information. We investigated the responses of neurons in the monkey sSC during a delayed non-matching-to-sample (DNMS) task in which monkeys were required to discriminate among five categories of visual stimuli [photos of faces with different gaze directions, line drawings of faces, face-like patterns (three dark blobs on a bright oval), eye-like patterns, and simple geometric patterns]. Of the 605 sSC neurons recorded, 216 neurons responded to the visual stimuli. Among the stimuli, face-like patterns elicited responses with the shortest latencies. Low-pass filtering of the images did not influence the responses. However, scrambling of the images increased the responses in the late phase, and this was consistent with a feedback influence from upstream areas. A multidimensional scaling (MDS) analysis of the population data indicated that the sSC neurons could separately encode face-like patterns during the first 25-ms period after stimulus onset, and stimulus categorization developed in the next three 25-ms periods. The amount of stimulus information conveyed by the sSC neurons and the number of stimulus-differentiating neurons were consistently higher during the 2nd to 4th 25-ms periods than during the first 25-ms period. These results suggested that population activity of the sSC neurons preferentially filtered face-like patterns with short latencies to allow for the rapid processing of coarse facial information and developed categorization of the stimuli in later phases through feedback from upstream areas.
Licença:	Copyright © 2014 Nguyen, Matsumoto, Hori, Maior, Tomaz, Tran, Ono and Nishijo. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. Fonte: <10.3389/fnbeh.2014.00085>. Acesso em: 4 jul. 2017.
DOI:	https://dx.doi.org/10.3389/fnbeh.2014.00085
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