Особенности оптомоторной реакции жуков-навозников — Geotrupes (Coleoptera, Scarabaeidae)

Abstract

Изучена зависимость реакции поворота от оптических характеристик движущегося стимула, а также распределение чувствительности к вращению в поле зрения. Полученные данные сопоставлены со свойствами нейронов, выделяющих направленное движение в поле зрения.The optomotor response (OMR) was measured by the modified method of Hassenstein. The OMR was observed at angular velocities of 0.5—5500° per. sec. The optimal frequency of contrast was 3—5 sec⁻¹ . The sensitivity to rotating patterns was similar in frontal, middle, and hind parts of an eye. Every eye ensures a half of the turning command. With one eye shuttered by a white or striped mask, an animal responded symmetrically to both directions of rotation. If one eye was blinded or shuttered with a black mask, the negative phototaxis could be added to OMR. The response to inclined stripes (10—50°) is the same as that to vertical stripes, so the detector of the vertical edge is not included in the control system of OMR. When presented with a rotating optic cline the animal responded stronger to the sharp dark edge, than to the light one. An insect, placed between two parallel striped discs, did not response to the direction of their apparent movement: backward or forward — if the stimuli from both sides are equivalent.