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1981 (1)
1978 (1)
1977 (1)
1Author    R. C. HardieRequires cookie*
 Title    E lectrophysiological Properties of R7 and R8 in D ipteran Retina  
 Abstract    Intracellular recording and dye injection have directly demonstrated the absolute and spectral sensitivities of R7 and R8 in the eye of Calliphora. R8 has major peak of sensitivity at 547 nm with less than half the bandwidth of a theoretical rhodopsin, and a subsidiary peak at 358 nm. R7 is confirmed as being an ultraviolet receptor. Both have absolute sensitivities similar to those of R l —6. These results are inconsistent with the scotopic (R l —6), photopic (R7 and R8) theory of fly vision. 
  Reference    (Z. Naturforsch. 32c, 887 [1977]; received August 29 1977) 
  Published    1977 
  Keywords    Diptera, Receptor, Central Rhabdomere, Spectral Sensitivity, Dye-injection 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0887_n.pdf 
 Identifier    ZNC-1977-32c-0887_n 
 Volume    32 
2Author    David Dvorak, Allan SnyderRequires cookie*
 Title    The Relationship between Visual Acuity and Illumination in the Fly, Lucilia sericata  
 Abstract    The variation in visual acuity with illumination has been studied by monitoring the extracellular response of direction sensitive motion detecting neurons to a drifting sine wave grating displayed upon an oscilloscope spreen. Acuity reaches a maximum value of 0.46 cycles/degree at luminances above 1.0 cd/m2 and decreases gradually over a 3.8 log unit attenuation in intensity to a minimum value of 0.05 cycles/degree. The results have been compared with theoretical acuity curves for the coupound eye with various dark adaptation mechanisms. The analysis indicates that a major strategy of dark adaptation in the fly is a process involving intensity-dependent neural summation of signals from photoreceptors having different visual axes. 
  Reference    Z. Naturforsch. 33c, 139 (1978); received November 9 1977 
  Published    1978 
  Keywords    Diptera, Insect, Vision, Visual Acuity, Electrophysiology 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0139.pdf 
 Identifier    ZNC-1978-33c-0139 
 Volume    33 
3Author    H. Endrick, E. A. Eckert, K. Urt, H. Am DorfRequires cookie*
 Title    Action Potentials in "Non-Spiking" Visual Interneurones  
 Abstract    The response o f the homolateral "horizontal cells" (H-cells) o f the third visual neuropile o f the blowfly, Phoenicia sericata, has been investigated by intracellular recordings coupled with dye injections (Procion Yellow, cobaltous chloride). Responses were obtained from their terminal axon endings in the central protocerebrum. Under natural conditions, the horizontal cells respond not with graded potentials as reported previously, but with action potentials upon stimulation by regressive pattern motion within the contralateral receptive field. The stimulus-induced responses change from action potentials to graded signals within a few minutes after opening the head capsule. The possible causes o f this change, namely hypoxic conditions and a consequent depletion of the ATP-supply, are consistent with the experimental data: a change in the resting potential as well a reduction o f the spike amplitude. Furthermore, the possibility of two functionally different output regions o f the H-cells is discussed, namely, (1) the terminal axon endings appear to conduct action potentials induced by the contralateral input (to the H-cells). Thus, these endings provide a solely contralateral, i.e. "monocular output". Whereas (2) the axonal arborisation appears to conduct graded signals elicited by the ipsilateral input onto which the contralateral input is superimposed, thus providing a "binocular output". 
  Reference    Z. Naturforsch. 36c, 470—4 (1981); received August 7 1980/January 21 1981 
  Published    1981 
  Keywords    Vision, Diptera, Central Nervous System, Identified Neurones, Graded Signal Transmission 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0470.pdf 
 Identifier    ZNC-1981-36c-0470 
 Volume    36