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Tonic and phasic systems in parallel in the eyecup responses of the crab Carcinus

Horridge, George Adrian; Burrows, M.


Summary 1. Static positions of the eyecup are maintained by control of the frequency of impulses to tonic muscle fibres. 2. In addition, phasic muscle fibres are excited when an optokinetic stimulus containing frequency components faster than about 0.1 Hz. exceeds about 0.1° in amplitude. 3. Within the above limit, components of the stimulus of greater frequency or amplitude excite the phasic system, which adapts in a few seconds. Normally the tonic and phasic systems act in...[Show more]

CollectionsANU Research Publications
Date published: 1968-10-01
Type: Journal article
Source: Journal of Experimental Biology
Access Rights: Open Access


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