Accession Number : AD0610426

Title :   EXPERIMENTS ON VISUAL RESPONSES IN INSECTS.

Descriptive Note : Final rept. for 14 Oct 63-14 Oct 64,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : Bliss,J. C. ; Chapple,W. D. ; Crane,H. D. ; Seeley,H. F.

Report Date : NOV 1964

Pagination or Media Count : 64

Abstract : The optomotor response of the milkweed bug Oncopeltus fasciatus Dallas (Hemiptera) is described. The animal is placed in the center of a rotating striped drum; as the drum rotates, the animal tends to turn in the direction of stripe rotation. This turning tendency vs. drum speed approximates the bell-shaped curve first measured by Hassenstein (1951). Measured optical constants of compound eyes are also described and possible explanations are offered of certain observed phenomena relating to the appearance of 'multiple image planes' behind the array of lenslets. The cyclic discharge of motor fibers in response to decreases in light intensity is discussed. A similar discharge was observed using a single 55-degree stripe rotating about the animal; the ratio of firing frequency of the large motor fibers in the left and right metathoracic roots was a function of the direction of stripe rotation. The firing frequency was also a function of the speed of stripe rotation. Stimulation experiments suggest that the response is triggered by a simple phasic discharge in the connectives. A physiological model incorporating the results of these experiments is described. (Author)

Descriptors :   (*INSECTS, VISION), (*VISION, HEMIPTERA), OPTIC NERVE, CENTRAL NERVOUS SYSTEM, REFLEXES, EYE, ARTHROPODA, VISUAL PERCEPTION, VISUAL ACUITY, NERVE CELLS, STIMULATION(PHYSIOLOGY), BEHAVIOR, IMAGES, MATHEMATICAL MODELS, ROTATION, PHYSIOLOGY

Distribution Statement : APPROVED FOR PUBLIC RELEASE