Abstract
1. In the crayfish, behavioral arousal is known to elicit walking and to enhance compensatory eye movements. 2. To see if serotonin and octopamine modulate arousal, we measured their effects on walking and eye movements in tethered crayfish, Procambarus clarkii. Serotonin strongly suppresses both walking and eye movements. 3. In contrast, octopamine elicits an arousal-like state of continuous jittery leg movements and increased eye movements. 4. Serotonin's effect on arousal is uncertain, but octopamine remains a plausible modulator of behavioral arousal.
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