Abstract
This experiment investigates the effect of removing the anterior ganglia on the earthworm’s locomotor response to light. Ss with their five anterior segments amputated, Ss with both pairs of ganglia surgically isolated, and Ss with only the supraoeosophageal ganglia removed showed increased locomotor activity during a period of exposure to intermittent light as compared with periods of darkness. Normal and sham operated Ss also showed increased reactivity to light but were significantly less reactive than two of the operated groups.
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