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開催日 2014/9/13
時間 14:00 - 15:00
会場 Poster / Exhibition(Event Hall B)

Cross-modal effect by preceding auditory stimulus on wind-elicited behavior in cricket

  • P3-174
  • 福富 又三郎 / Matasaburo Fukutomi:1 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 

Animals perceive environments via convergence process of various information from multiple sensory modalities. Information extracted from different modal of stimuli were integrated in the brain and modulate animal behaviors. The multisensory integration is assessed by considering effectiveness of a cross-modal stimulus combination to neuronal or behavioral responses (Stein and Stanford, 2008). Psychophysiological experiments in humans and neurophysiological studies in mammals have revealed physiological mechanisms for the multisensory integration. However, little is known about how neural circuit underlying multisensory integration modulates the animal behavior. We developed a new cross-modal behavioral paradigm to test multisensory integration in the cricket, which has simple neural system consisted of smaller number of neurons. Crickets have two different aero-detecting sensory organs, one of which is tympanal organ to hear male songs and the other is wind-sensitive organ called 'cerci'. Information of stimulus direction is extracted by both of these sensory systems to mediate distinct 'oriented behaviors'. The auditory system induces positive phonotaxis to approach a singing male, and the cercal system triggers quick walking considered as 'escape behavior' from a predator. To verify the multisensory integration between the auditory and cercal sensory systems, we examined behavioral response to air-current stimulus combined with 10-kHz pure tone. Exposure of tone sound preceding air current from lateral side alters walking direction to backward, but does not modulate other locomotion parameters including turn angle, walking speed, and response time. Auditory modulation of walking direction did not depend on the stimulus side of the preceding tone. These results demonstrated cross-modal effects between auditory and cercal sensory systems, but did not suggest multisensory integration of directional information.

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