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Neuronal activity during spontaneous walking--I. Starting and stopping.
1Fachbereich für Biologie, Universität Regensburg, FRG.
Summary
Locusts exhibit preparatory movements before spontaneous walking, involving specific brain and suboesophageal descending interneurons. Sensory-evoked walking lacks this preparatory phase, suggesting distinct neural control mechanisms for locomotion.
Area of Science:
- Neuroscience
- Animal Behavior
- Locomotion
Background:
- Spontaneous locomotion in insects involves preparatory phases.
- The neural circuits underlying spontaneous versus evoked walking are not fully understood.
Purpose of the Study:
- To investigate the neural activity preceding spontaneous walking in locusts.
- To compare neural patterns during spontaneous and sensory-evoked walking.
Main Methods:
- Electrophysiological recordings of descending interneurons (DINs) in locust brains.
- Observation of locust behavior during spontaneous and stimulated walking.
Main Results:
- A preparatory phase with "intentional" movements precedes spontaneous walking, absent in sensory-evoked walking.
- Specific brain and suboesophageal (SOG) DINs activate before spontaneous walking.
- Complex and prolonged neural activity patterns characterize spontaneous starts and stops, differing from evoked locomotion.
Conclusions:
- Locust locomotion initiation involves distinct neural pathways for spontaneous and sensory-evoked actions.
- The suboesophageal ganglion plays a key role in recruiting DINs for spontaneous walking.
- Findings refine current models of insect motor control and decision-making.