Optomotor response studies of insect vision

摘要: Precise methods have been developed to study the optomotor responses of insects in correlation with microprobing and histology. These include stimulus patterns whose noise power is controlled one part per million a directly-connected digital computer system that permits accurate reduction analysis responses. A range flight head torque reactions was studied for Musca domestica. Patterns producing gross temporal changes or sudden transients were found elicit more complex than hitherto reported. However, steady precision cylindrical various wavelengths, rotating at precisely constant velocity, provided detailed information on optical properties ommatidia motion-detection capabilities eye. studies indicate photoreceptors can be characterized by visual fields full width 50% effective light flux sensitivity about 5 degrees dark-adapted state. It is, however, 40% less light-adapted case. Histological investigations show this caused shielding pigment migration. Correlated acuity detected an adaptation period 10 min. Detection velocity motion involve interaction only few adjacent total given simple saturable summation these unit interactions. This process parallel from many areas field provides very high signal ratio nervous system, enabling insect detect quite low intensity contrast when wavelength greater 15 20 degrees. Thresholds such are three orders magnitude below those response signals normally detectable retinular cells. relatively interommatidial spacing results rapid increase threshold reduced wavelength. The 3 pattern exceeds factor 1000. minimum used. Many apparent reported other attributed inaccuracies patterns.