Abstract

The activity of the optomotor interneurons in the locust optic lobe varies with arousal states. Two behaviourally different arousal situations can be readily reproduced in the locust, a spontaneous and an evoked arousal change. These produce different neuronal correlates in the optomotor interneurons, suggesting the presence of different arousal pathways possibly acting at different sites in the motion detection chain. Furthermore, an additional arousal effect can be demonstrated at the motoneurons showing that a reflex system is sensitive to arousal modulation at several levels.

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