Behavioral Consequences of Laser Lesions in the Central Nervous System ofAraneus diadematusCl.

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Abstract
A laser beam of 6.5-1 joule is directed for 1 msec at dorsal surfaces of adult female Araneus diadematus Cl. spiders. The lesion is located by means of histological methods, and relationship of its position to behavioral consequences—as measured by changes in the web-pattern—are studied. Twelve animals with lesions in the area of the supra-esophageal ganglion show different degrees of extensive web-pattern disturbances consisting of smaller and rounder webs with less detail and irregular spacing of threads. Limitations of the method and the role of the supra-esophageal ganglion in Araneus as an overall integrating center of sensory motor coordination in web-building are discussed.

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