Columnar neurons support saccadic bar tracking in Drosophila

Area of Science:

• Neuroscience
• Animal Behavior
• Sensory Systems

Background:

• Visual object tracking requires coordinating distinct computational demands for figure-ground discrimination and behavioral control.
• Drosophila melanogaster employs smooth movements for gaze stabilization and saccades for tracking vertical bars.

Purpose of the Study:

• To investigate the role of T3 cells in driving bar tracking saccades in Drosophila.
• To determine if T3 cells represent a parallel pathway distinct from T4/T5 cells controlling gaze stabilization.

Main Methods:

• Combined physiological recordings and behavioral experiments in Drosophila melanogaster.
• Utilized optogenetic manipulation to modulate T3 cell activity.
• Recorded T3 neuron responses to visual stimuli and analyzed saccade frequency.

Main Results:

• T3 neurons responded omnidirectionally to stimuli that trigger bar tracking saccades.
• Silencing T3 cells decreased the frequency of tracking saccades.
• Optogenetic manipulation of T3 cells affected saccade rate without impacting smooth optomotor responses.

Conclusions:

• Parallel neural pathways in Drosophila coordinate smooth gaze stabilization and saccadic bar tracking.
• T3 cells are specifically involved in driving bar tracking saccades, distinct from the T4/T5 pathway for gaze stabilization.