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High-Resolution Video Tracking of Locomotion in Adult Drosophila Melanogaster
Published on: February 20, 2009
Walking modulates speed sensitivity in Drosophila motion vision.
M Eugenia Chiappe1, Johannes D Seelig, Michael B Reiser
1Janelia Farm Research Campus, Howard Hughes Medical Institute, 19700 Helix Drive, Ashburn, VA 20147, USA.
Current Biology : CB
|July 27, 2010
Summary
Fruit flies
Area of Science:
- Neuroscience
- Animal Behavior
- Visual Processing
Background:
- Behavioral states influence neural activity in various systems.
- In vertebrates, such modulations are linked to attention and sensorimotor transformations.
- The visual-motor pathway in Drosophila is crucial for navigation.
Purpose of the Study:
- To investigate state-dependent activity modulations in Drosophila's visual-motor pathway during walking.
- To understand how neural activity in motion-sensitive cells changes with locomotion.
- To explore the functional implications of these modulations for visual processing.
Main Methods:
- Utilized two-photon imaging to monitor intracellular calcium activity.
- Recorded activity in motion-sensitive lobula plate tangential cells (LPTCs) in head-fixed Drosophila.
- Flies walked on an air-supported ball to simulate locomotion.
Main Results:
- Horizontal system (HS) neurons, a subgroup of LPTCs, exhibited stronger calcium transients during walking compared to resting.
- These amplified responses correlated with walking speed.
- HS neurons showed increased gain at higher temporal frequencies and a shift in optimal temporal frequency towards higher motion speeds.
Conclusions:
- Walking-dependent modulation of HS neurons facilitates processing of higher image speeds.
- This mechanism aids in course stabilization during locomotion in Drosophila.
- The findings reveal a state-dependent adaptation in the fly visual system for efficient navigation.
