1993 Fiscal Year Final Research Report Summary
test of zone activity hypothesis II
| Project/Area Number |
03670054
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Neurophysiology and muscle physiology
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| Research Institution | Toyama Medical and Pharmaceutical University |
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Principal Investigator |
SATO Yu Toyama Medical and Pharmaceutical University, Faculty of Medicine, Associate Professor, 医学部, 助教授 (60111746)
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| Project Period (FY) |
1991 – 1993
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| Keywords | Cerebellum / Purkinje cell / simple spike / complex spike / zone |
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| Research Abstract |
We recorded the CS activity together with concomitant simple spike (SS) activity of the floccular Purkinje cells that responded to large-field visual pattern movement in the anesthetized cat. On the basis of the direction selectivity, we divided the cells into two major types : the horizontal stimuli and the vertical type that preferred vertical stimuli. The CS activity of the horizontal type cell increased during stimuli directed contralaterally to the recording site and decreased during ipsilaterally directed stimuli, while that of the vertical type cell increased during upward stimuli and decreased during downward stimuli. In both types, the CS response was larger at lower velocity stimuli, and the response was well maintained at higher velocity stimuli up to 180 ﾟ/s tested. The majority of the horizontal type cells were modulated by the stimuli presented to either eye, and the dominant eye was ipsilateral to the recording site. The majority of the vertical type cells were also modulated by the stimuli presented to either eye without obvious differences between two eyes. The receptive field of the ipsilateral eye always included the area centralis and extended widely on both visual hemifields. The CS and SS responses were reciprocal to each other, that is, when the CS firing increased, the SS firing decreased and vice versa.
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