Interaction of compass sensing and object-motion detection in the locust central complex

Area of Science:

• Neuroscience
• Animal Behavior
• Insect Navigation

Background:

• Goal-directed behavior in insects is challenged by unpredictable events, necessitating adaptive responses.
• Spatial orientation in insects relies on the central complex, which processes sky polarization patterns for navigation.
• Central complex neurons, including sky compass cells, are sensitive to polarized light and moving objects.

Purpose of the Study:

• To investigate how moving objects affect the compass signaling activity of central complex neurons in desert locusts.
• To understand the neural mechanisms underlying adaptive responses to threats during navigation.

Main Methods:

• Recording neural activity in desert locusts' central complex.
• Presenting stationary polarized light and small moving objects to stimulate neurons.
• Analyzing neuronal responses to assess the influence of moving objects on compass signaling.

Main Results:

• Some neurons showed additive responses to moving objects combined with adapted compass signals.
• Other neurons exhibited disadaptation, regaining full compass response upon presentation of a moving object.
• A neuronal network model based on central complex architecture explained these varied responses.

Conclusions:

• Central complex neurons integrate compass information with threat detection signals.
• The observed neuronal responses, including disadaptation, may facilitate post-escape reorientation and course correction.
• Neuronal network dynamics within the central complex explain adaptive behavioral responses to environmental challenges.