Neural basis of spatial behavior in insects : Development of a new recording system for locomotor and neural activities and its application.

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Toward understanding the neural basis of spatial behavior in insects, we have developed a novel experimental system for simultaneous recording of the locomotor behavior and neural activities from freely walking insects. The system measures 2-D coordinates of the animal' s position, orientation of the body axis, and2CH extracellular neural activities. We applied this system to the field cricket and recorded spike unit activity from the brain neurons during spontaneous walking. Locomotor-related neurons were mainly located in the protocerebral area.