Figure 7.

Response of the model during latent inhibition task with simulated lesion of MS/VDB. Plots showing the neural activity, the strength of plastic synapses, and the number of correct actions performed in a row during a typical run, until the criterion was reached. In this example, the network learned to complete the task in 12 trials (240 time-steps). The activity of the action selection neuron corresponding to the correct action increased rapidly over time due to Hebbian learning modulated by reward. In this example, connections from the Decremental area to the MS/VDB increased slowly over time until the MS/VDB was lesioned at 800 time-steps. Therefore, the Decremental area was not strongly inhibiting the Modulated input area, and did not cause a difficulty in learning (i.e., latent inhibition).