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1979 (1)
1978 (1)
1974 (1)
1Author    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 
2Author    Uwe Homberg, Joachim ErberRequires cookie*
 Title    Response Characteristics and Identification of Extrinsic Mushroom Body Neurons of the Bee  
 Abstract    The activity o f single neurons with constant discharge frequencies in the area around the a-lobe o f the mushroom bodies o f the bee was recorded intracellularly. The spontaneous discharge fre­ quency o f these neurons ranged between 5 and 95 im pulses per second. W hen stimulated, about 80 percent o f the neurons responded to at least one o f five different sensory modalities: scent; light; air current to the antennae; sugar water applied to the antennae and to the proboscis. 45 percent o f the neurons responded to two or more m odalities, these multimodal neurons are com ­ mon in the median protocerebrum o f the bee. The differentiated response pattern o f the cells does not allow a simple classification. Som e o f the neurons were identified after the injection o f the flu­ orescent dye Procion yellow. W e found 4 neurons with arborizations in the a-lobe and the calyces o f the mushroom bodies. 
  Reference    Z. Naturforsch. 34c, 612 (1979); received April 12 1979 
  Published    1979 
  Keywords    Bee, Brain, M ushroom Bodies, Electrophysiology, Identified Neurons 
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 TEI-XML for    default:Reihe_C/34/ZNC-1979-34c-0612.pdf 
 Identifier    ZNC-1979-34c-0612 
 Volume    34 
3Author    Gerhard HeideRequires cookie*
 Title    The Influence of Wingbeat Synchronous Feedback on the Motor Output Systems in Flies  
 Abstract    Action potentials have been recorded from fibrillar and from non-fibrillar flight muscles of tethered flying flies (Calliphora erythrocephala and M usca dom estica). Analyses of the spike-trains from the fibrillar muscles reveal a clear preference of the spikes to appear at a special phase with respect to the wingbeat cycle. This holds true even in cases of ex­ perim entally changed motor output patterns. There seems to be some kind of wingbeat-synchronous feedback which influences the output system phasically. Crosscorrelations between spike-trains from the fibrillar muscles on the one hand and the non-fibrillar muscles on the other give evidence that there are strong interactions between the output producing neurons of both systems with at least one inhibitory pathway. 
  Reference    (Z. Naturforsch. 29c, 739 [1974]; received August 2 1974) 
  Published    1974 
  Keywords    Calliphora, Musca, Insect Flight, Motor O utput, Flight Muscles, Electrophysiology 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0739.pdf 
 Identifier    ZNC-1974-29c-0739 
 Volume    29