期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 113, 期 49, 页码 E7966-E7975出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1618196113
关键词
behaving monkeys; somatosensory cortex; dorsal premotor cortex; pattern discrimination; categorical code
资金
- Direccion de Asuntos del Personal Academico de la Universidad Nacional Autonoma de Mexico
- Consejo Nacional de Ciencia y Tecnologia [FIS2015-67876-P]
The problem of neural coding in perceptual decision making revolves around two fundamental questions: (i) How are the neural representations of sensory stimuli related to perception, and (ii) what attributes of these neural responses are relevant for downstream networks, and how do they influence decision making? We studied these two questions by recording neurons in primary somatosensory (S1) and dorsal premotor (DPC) cortex while trained monkeys reported whether the temporal pattern structure of two sequential vibrotactile stimuli (of equal mean frequency) was the same or different. We found that S1 neurons coded the temporal patterns in a literal way and only during the stimulation periods and did not reflect the monkeys' decisions. In contrast, DPC neurons coded the stimulus patterns as broader categories and signaled them during the working memory, comparison, and decision periods. These results show that the initial sensory representation is transformed into an intermediate, more abstract categorical code that combines past and present information to ultimately generate a perceptually informed choice.
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