Attractor Bump Model with Two Maps

Copyright (c) 1999 by David S. Touretzky, and
(c) 2000-2002 by David S. Touretzky and Marios Savvides.

Follows the equations in: 
  Goodridge, J.P. and Touretzky, D. S. (2000) Modeling
  attractor deformation in the rodent head direction system.
  Journal of Neurophysiology, 83(6):3402-3410.

Original version created April, 1999 by David S. Touretzky.  Modified
June 2000 by David S. Touretzky and Marios Savvides to overlay two
attractor maps and allow external input to make the bump jump from one
map to the other.

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Instructions for use:

This software requires MATLAB version 5 or higher.

To run the model, type "twomap".

Mouse on one of the flanks of the bump, in either map, to supply
external input and make the attractor bump move.  The height of the
mouse above the x-axis determines the magnitude of the external input.
Multiple mouse clicks have additive effects.

Turn on "Input Hold" to suspend decay of external input.

To get the bump to switch maps, supply strong external input anywhere
in the other map.  (You may want to use Input Hold for this.)  This
will cause the bump in the current map to collapse as a new bump forms
in the second map.

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This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA