Abstract
SUMMARY The reaction time of the optomotor response of the jumping spider Heliophanus muscorum Walck. (Araneae Salticidae), induced by a rotating archimedean spiral (turning reaction), mediated by the lateral eyes, seems to be inversely proportional to the angular velocity of « apparent » expansion or contraction of the target (depending on the sense of rotation). The frequently associated withdrawal movement (avoidance effect?) is at least to some extent a function of the stimulus size, since it is present only with angular sizes of the target > 14–15°. The data obtained with a hyperbolic spiral as a stimulus differ from the preceding ones in the sense that the reaction time and the withdrawal movement were not significantly affected by target distance within the ranged tested. The possible explanations of this behaviour are discussed in the text.
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