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'Photoreceptors' in keywords Facet   Publication Year 1993  [X]
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1993[X]
1Author    Nikolaus TrojeRequires cookie*
 Title    Spectral Categories in the Learning Behaviour of Blowflies  
 Abstract    Wavelength discrimination in the flower visiting blowfly Lucilia spec, was investigated in an attempt to elucidate the mechanisms underlying colour vision in this insect. The flies were sub­ jected to a classical conditioning procedure in which they had to discriminate between a re­ warded and an unrewarded monochrom atic light stimulus. The results reveal large wavelength ranges within which no discrimination occurs, between which, however, a very distinct dis­ crimination is found. The first range consists o f the UV region up to 400 nm (U V). The second range comprises wavelengths between 400 nm and 515 nm (B L U E) and the third range all wavelengths longer than 515 nm (YELLOW). A simple model consisting o f two colour oppo­ nent subsystems (R 7 p /R 8 p and R 7 y /R 8 y) can explain these results. Each o f the two subsys­ tems is assumed to evaluate only whether the sign o f the difference between the excitations o f R 7 and R 8 is positive or negative. For the whole system there are thus four possible condi­ tions: p +y +, p +y", p~y+, p "y~. Three o f them correspond to the experim entally obtained wave­ length ranges. The fourth condition (p+y~) might represent a still hypothetical PU R PLE cate­ gory in which the stimulus is made up o f both short and long wavelengths. 
  Reference    Z. Naturforsch. 48c, 96—104 (1993); received January 7 1993 
  Published    1993 
  Keywords    Blowfly, W avelength Discrimination, Colour Categories, Learning, Photoreceptors 
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 TEI-XML for    default:Reihe_C/48/ZNC-1993-48c-0096.pdf 
 Identifier    ZNC-1993-48c-0096 
 Volume    48