Dynamic fading memory and expectancy effects in the monkey primary visual cortex

• 成果类型: Article
• 署名作者: Yang, Yiling; Klon-Lipok, Johanna; Shapcott, Katharine; Lazar, Andreea; Singer, Wolf
• 署名单位: Max Planck Society; Max Planck Society
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-12140
• DOI: 10.1073/pnas.2314855121
• 发表日期: 2024-02-20
• 关键词: working-memory; prefrontal cortex; neuron activity; delay activity; hidden states; beta bursts; REPRESENTATIONS; adaptation; responses; gamma

摘要

In order to investigate the involvement of the primary visual cortex (V1) in working memory (WM), parallel, multisite recordings of multi - unit activity were obtained from monkey V1 while the animals performed a delayed match - to- sample (DMS) task. During the delay period, V1 population firing rate vectors maintained a lingering trace of the sample stimulus that could be reactivated by intervening impulse stimuli that enhanced neuronal firing. This fading trace of the sample did not require active engagement of the monkeys in the DMS task and likely reflects the intrinsic dynamics of recurrent cortical networks in lower visual areas. This renders an active, attention- dependent involvement of V1 in the maintenance of WM contents unlikely. By contrast, population responses to the test stimulus depended on the probabilistic contingencies between sample and test stimuli. Responses to tests that matched expectations were reduced which agrees with concepts of predictive coding.