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1998 (1)
1994 (1)
1Author    AxelA H OffRequires cookie*
 Title    Chaos Control and Neural Classification  
 Abstract    Chaotic behaviour in biological neural networks is known from various experiments. The recent finding that it is possible to "control" chaotic systems may help answer the question whether chaos plays an active role in neutral information processing. It is demonstrated that a m ethod for chaos control which was proposed by Pyragas can be used to let a chaotic system act like an autoassocia-tive memory for time signal inputs. Specifically a com bined chaotic and chaos control system can reconstruct unstable periodic orbits from incomplete information. The potential relevance o f these findings for neural information processing is pointed out. 
  Reference    Z. Naturforsch. 49a, 589—5 (1994); received December 20 1993 
  Published    1994 
  Keywords    Chaos control, Neural networks, Classification, Associative memory 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0589.pdf 
 Identifier    ZNA-1994-49a-0589 
 Volume    49 
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