| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
The neuronal processes that underlie visual searches can be divided into two stages: target discrimination and saccade preparation/generation. This predicts that the length of time of the pre-discrimination stage varies according to the search difficulty across different stimulus conditions, whereas the length of the latter post-discrimination stage is stimulus-invariant. To address this hypothesis, we recorded single-neuron activity in the lateral intraparietal area (LIP) when monkeys performed a visual search task using different stimulus conditions. The results revealed that post-discrimination intervals varied across stimulus conditions. Further analysis revealed that the post-discrimination interval may vary with stimulus luminance. A computer simulation using an accumulation-to-threshold model suggested that the luminance-related difference in visual response strength at the discrimination time could be the cause of the different post-discrimination intervals.
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