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開催日 2014/9/13
時間 11:00 - 12:00
会場 Poster / Exhibition(Event Hall B)

Multisensory ascending neurons responding to auditory and airflow stimuli in the cricket

  • P3-175
  • 染谷 真琴 / Makoto Someya:1 小川 宏人 / Hiroto Ogawa:2 
  • 1:北海道大院・生命・生命システム / Biosystem Sci, Grad Sch Life Sci, Hokkaido Univ, Hokkaido. Japan 2:北海道大院・理・生物科学 / Dept Bio Sci, Fac Sci, Hokkaido Univ, Hokkaido, Japan 

Combining various inputs from different kinds of sensory organs allow animals to perceive the surrounding environment accurately. Response properties of individual multisensory neurons that integrate multiple inputs of various sensory modalities have been well studied, but it is still unkown what neural circuit achieved the multisensory integration. To clarify the whole picture of the neural circuits performing multisensory integration at cellular level, we examined the neural system for multisensory integration in directional information of auditory and mechanosensory stimuli in central nervous system of the cricket. Cricket has distinct aero-detecting organs, one of which is cercal system to detect the bulk airflow, and the other is tympanal organ to hear high-frequency sound like 'song'. In the cercal system, sensory information of airflow is processed by local circuit within the terminal abdominal ganglion and conveyed by identified projection neurons to thoracic and cephalic ganglia. Also in auditory system, auditory information is primarily processed within the prothoracic ganglia, and conveyed to the cephalic ganglia by other identified projection neurons. In this study, we recorded ascending spikes evoked by sound and airflow stimuli, and examined the responsiveness of individual units isolated by a novel spike sorting algorithm. We found that about 60 % of responding units were multisensory type, which elevated their firing rate in response to both sound and airflow stimuli. These multisensory units exhibited larger increase in the firing response and blunter selectivity to the stimulus direction than uni-sensory units. Further investigation using optical imaging of prothoracic ganglion will illuminate neural circuitry involved in the multisensory integration between auditory and cercal sensory systems.

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