Population coding for figure-ground texture segregation in macaque V1 and V4.

Autor: Zhao XN; School of Psychological and Cognitive Sciences, Peking University, Beijing, China; PKU-Tsinghua Center for Life Sciences, Peking University, Beijing, China., Dong XS; School of Psychological and Cognitive Sciences, Peking University, Beijing, China; PKU-Tsinghua Center for Life Sciences, Peking University, Beijing, China., Jiang DQ; School of Psychological and Cognitive Sciences, Peking University, Beijing, China; PKU-Tsinghua Center for Life Sciences, Peking University, Beijing, China., Wu S; School of Psychological and Cognitive Sciences, Peking University, Beijing, China; PKU-Tsinghua Center for Life Sciences, Peking University, Beijing, China; IDG-McGovern Institute for Brain Research, Peking University, Beijing, China., Tang SM; PKU-Tsinghua Center for Life Sciences, Peking University, Beijing, China; IDG-McGovern Institute for Brain Research, Peking University, Beijing, China; School of Life Sciences, Peking University, Beijing, China. Electronic address: tangshm@pku.edu.cn., Yu C; School of Psychological and Cognitive Sciences, Peking University, Beijing, China; IDG-McGovern Institute for Brain Research, Peking University, Beijing, China. Electronic address: yucong@pku.edu.cn.
Jazyk: angličtina
Zdroj: Progress in neurobiology [Prog Neurobiol] 2024 Sep; Vol. 240, pp. 102655. Date of Electronic Publication: 2024 Jul 04.
DOI: 10.1016/j.pneurobio.2024.102655
Abstrakt: Object recognition often involves the brain segregating objects from their surroundings. Neurophysiological studies of figure-ground texture segregation have yielded inconsistent results, particularly on whether V1 neurons can perform figure-ground texture segregation or just detect texture borders. To address this issue from a population perspective, we utilized two-photon calcium imaging to simultaneously record the responses of large samples of V1 and V4 neurons to figure-ground texture stimuli in awake, fixating macaques. The average response changes indicate that V1 neurons mainly detect texture borders, while V4 neurons are involved in figure-ground segregation. However, population analysis (SVM decoding of PCA-transformed neuronal responses) reveal that V1 neurons not only detect figure-ground borders, but also contribute to figure-ground texture segregation, although requiring substantially more principal components than V4 neurons to reach a 75 % decoding accuracy. Individually, V1/V4 neurons showing larger (negative/positive) figure-ground response differences contribute more to figure-ground segregation. But for V1 neurons, the contribution becomes significant only when many principal components are considered. We conclude that V1 neurons participate in figure-ground segregation primarily by defining the figure borders, and the poorly structured figure-ground information V1 neurons carry could be further utilized by V4 neurons to accomplish figure-ground segregation.
Competing Interests: Declaration of competing interest None.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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