USC Brain Project: Hippocampus and Navigation Group

The TAM-WG Model: Homepage

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Executing the model ...

You are encouraged to read the section Understanding the model before attempting to execute it.

Over the net ...

For some strange reason, Netscape Communicator cannot run the code. If you have a PC, Internet Explorer runs the code without any problems.

When ready to execute the TAM-WG model, just click on the hippocampus below.

Downloading ...

You can also download the tar file TAM_WG.tar.gz (170 Kbytes) containing all the java classes (JDK 1.0.2) for the TAM-WG model into your machine. Use gunzip to unzip the file:

gunzip TAM_WG.tar.gz

and TAR:

tar xvf TAM_WG.tar

to extract the files. You will then be able to execute the model by using appletviewer (no flickering):

av tam_wg_model.html

The file tam_wg_model.html is contained in the tar file.

ATTENTION! An updated version of TAM-WG containing many new experiments will be available soon (Java 1.2).

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Understanding the model ...

The TAM-WG model, as its name suggests, reflects the integration of two other models, the Taxon-Affordances Model (TAM) and the World Graph (WG) model. A description of both models can be found in: Or in related papers from our Hippocampus and Navigation Group.

Currently, TAM-WG implements four different behavioral experiments, which were originally described in:

In the code you are about to execute, the main window (shown below) is composed of two multiple selection pull-down menus. The first refers to the kind of experiment you are able to execute.

The model allows you to choose one of the following experiments:

If you select any control group, TAM-WG will be executed and the WG related windows will be displayed. The model will take a while to start executing, since it will go through a pre-training phase first. You can follow this phase by choosing to see the Java Console window in your browser.

If you select any fornix-lesioned group, TAM will be executed normally, since there will be no pre-training phase.

Once you select one experiment (and the pre-training phase is over for the control groups), a window displaying the maze environment will be created. Now, at any time, you can choose to see any of the other windows available in the system, these are called Output Windows and can be selected from the main window (shown above). The available "output" windows are:

The color scheme shown for the output windowns (coarse coding in an array of cells) represents the activity related to each cell of the array: Violet = no activity; Red = maximum activity). Beware that colors may change in different browser configurations and/or environments.

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Page under construction!

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University of Southern California Brain Simulation Lab

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University of Southern California Brain Simulation Lab
All rights reserved.
Author: Alex Guazzelli <aguazzel@rana.usc.edu>