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1998 (1)
1988 (1)
1Author    K. KirschfeldRequires cookie*
 Title    Navigation and Compass Orientation by Insects According to the Polarization Pattern of the Sky  
 Abstract    A recent theory attempts to explain how bees take their compass orientation from the pattern of polarized light in the sky (S. Rossel and R. Wehner, Nature 323, 128-131 (1986)). According to this theory, orientation can be erroneous and lead to the wrong course of a recruited bee in search of the foraging site whenever only a small patch of the blue sky is visible to the bee. It is shown that orientation under natural conditions is not erroneous, if the compass reference is variable in time but equally defined for both, scout bees and recruits. 
  Reference    Z. Naturforsch. 43c, 467—469 (1988); received January 25 1988 
  Published    1988 
  Keywords    Navigation, Compass Orientation, e-Vector, Insect, Bee 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0467.pdf 
 Identifier    ZNC-1988-43c-0467 
 Volume    43 
2Author    Neil Burgess, JamesG D Onnett, JohnO ' KeefeRequires cookie*
 Title    The Representation of Space and the Hippocampus in Rats, Robots and Humans  
 Abstract    Experimental evidence suggests that the hippocampus represents locations within an allo-centric representation of space. The environmental inputs that underlie the rat's representa­ tion of its own location within an environment (in the firing of place cells) are the distances to walls, and different walls are identified by their allocentric direction from the rat. We propose that the locations of goals in an environment is stored downstream of the place cells, in the subiculum. In addition to firing rate coding, place cells may use phase coding relative to the theta rhythm of the EEG. In some circumstances path integration may be used, in addition to environmental information, as an input to the hippocampal system. A detailed computational m odel of the hippocampus successfully guides the navigation of a mobile robot. The m odel's behaviour is compared to electrophysiological and behavioural data in rats, and implications for the role of the hippocampus in primates are explored. 
  Reference    Z. Naturforsch. 53c, 504 (1998); received April 27 1998 
  Published    1998 
  Keywords    Hippocampus, Navigation, Place Cell, Neural Networks, Robot 
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 TEI-XML for    default:Reihe_C/53/ZNC-1998-53c-0504.pdf 
 Identifier    ZNC-1998-53c-0504 
 Volume    53