A Computational Model of Hippocampal Function in Trace Conditioning
Elliot A. Ludvig, Richard S. Sutton, Eric Verbeek, & E. James Kehoe
Normal Hippocampal
0.8

TD Model of Conditioning
 Temporal Stimulus Representation  Simulated Hippocampal Damage

Microstimulus Level

·

0.8

0.6

0.6

0.4

0.4

0.2

0.2

0 0 500 1000

0 0 500 1000

Time (ms)

CR Magnitude

ISI250

CR Magnitude

5 5 4 4 3 3

5 4 3

ISI250 ISI500 ISI250

55 44

5 4 3 2 1 0

ISI500 ISI1000ISI500

·

ISI1000 5 5 Selective Trace Cond. Deficits
4 4

ISI1000

50

Delay!Normal 2 2 Delay!HPC 1 Trace!Normal 1 Trace!HPC 0 0 50 250 500 50

33 Delay!Normal Delay!Normal 22 2 Delay!HPCDelay!HPC Trace!Normrace!Normal T al 11 1 Trace!HPCTrace!HPC 0 0 0 50 2 50 250 250 500 50 500 50 500

3 3  Not in Delay Conditioning 2 2 1  Dependent 1 Interval (ISI) on
250 50 250

Poster:

Trials

 Trials Trials Results from Representational

0 5500 50 500 0 50 250 00 250

250 500

500

W11

Interaction