| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
We analyzed population coding scheme in wind-sensitive and auditory ascending neurons of the cricket. Decoding analysis of neural activities recorded extracellularly from connective nerve cords revealed that four neuronal units represented the directional information of air currents, while the direction of sound source was not represented by population activities of the auditory neurons. To identify the neuronal components for the population coding, we recorded the somatic responses of wind-sensitive ascending neurons using Ca imaging. The stimulus directions were decoded from the amplitude of Ca responses using a maximum likelihood method. Giant interneurons (GIs) 10-2 and 10-3 had higher decoding accuracy than other neurons, and the matched pair of these neurons encoded more accurate information than individual ones. These results indicated that two pairs of GIs 10-2 and 10-3 would be important components for encoding the directional information in the cricket wind-sensitive system.
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