| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1988: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1986: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Research Abstract |
Neural activities were recorded in the fronto-opercular cortex (Fop) including the gustatory area, of alert monkeys which were conducting tasting behavior. Facial ex-pression of the monkey was also recorded on video-tape, together with neural activities and EMG activities in the masseter. (1) in the Fop of two Japanese monkeys, drinking randomly given fluid from a spout, 3 types of neurons were noticed; On-type neurons re-sponding phasically at the onset of fluid application, Mo-type neurons activated during oral movement, e.g., chewing, and taste neurons differentially activated by different taste solutions. Among the On-type and Mo-type neurons, several tactile neurons with RFs on the lip and/or in the oral cavity were recognized. Though On-type neurons were found at all parts of the Fop, many Mo-type neurons were rather localized at the PrCO and taste neurons at areas G, 1-2 and OFO. (2) Two monkeys were trained to perform GO-NOGO task to discriminate between NaCL (GO cue) and water
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(NOGO cue). Sucrose were used as reward, and quinine as punishment. Reaction time from NaCL infiltration to bar-pressing and % correction ratio were dependent upon NaCL concentration. Neurons in the Fop re-sponded either to both cue stimuli (A-type), one of the cues (B-type), or to sucrose or quinine (C-type). A-type neurons were profound at the PrCO and assumed to be related to the attention in the task performance. B-type were located at areas G, 1-2 and OFO, and considered as taste neurons. C-type neurons were at aresa G, 1-2, and PrCO. Some of them might be related to psychological factor, i.e., reward or punishment, some might be taste neurons. Taste neurons were found in areas G and 1-2 in two types of chronic ex-periments, as in the previous acute experiment using anesthetized monkeys. Neurons in the PrCO may be related to attention in taskperformance. OFO may contained higher-order taste neurons as suggested by Rolls et al. (1985). (3) Gustatory matching to sample task was developed to use a number of taste solutions as cue stimuli to monkeys. Neurons in the Fop of monkeys performing this task will be investigated in near future. Less
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