Visual motion-sensitive neurons in the bumblebee brain convey information about landmarks during a navigational task

Area of Science:

• Neuroethology
• Animal Behavior
• Sensory Neuroscience

Background:

• Bees (Bombus terrestris) rely on visual memories and landmarks for spatial navigation and homing to food sources.
• Previous research indicates motion cues are sufficient for bees to use landmarks, but the neural encoding remains unclear.
• The role of motion-sensitive neurons in processing landmark information during learning flights is not well understood.

Purpose of the Study:

• To investigate if motion-sensitive neurons in the bee's visual system encode landmark information during learning flights.
• To determine the contribution of these neurons to goal localization using visual landmarks.

Main Methods:

• Tracking of free-flying bumblebee learning flights in an arena with visual landmarks.
• Reconstruction of visual input from flights and creation of ego-perspective movies.
• Recording of direction-selective wide-field neuron activity in tethered bees viewing these movies.

Main Results:

• Neuronal responses to landmarks were observed in motion-sensitive neurons during simulated learning flights.
• Responses showed minimal variation with landmark texture, aligning with behavioral observations.
• These neurons effectively represent landmark properties relevant for view-based homing.

Conclusions:

• Motion-sensitive neurons in bees' optic lobes play a crucial role in processing landmark information during navigation.
• These neurons contribute to spatial memory and homing behavior by encoding salient object features.
• The findings support the hypothesis that the bee visual motion pathway is vital for landmark-based navigation.