Anton and I have finished a proper study on latent inhibition using the eye tracker. Unlike the brief pilot Sam and I ran, the present project was conducted very carefully and with properly controlled conditions. I’ll be presenting the data at the XXIII International Congress of the Spanish Society for Comparative Cognition late next week. Afterwards I’ll publish the talk and data here.
In short, latent inhibition was robustly obtained. Pre-exposed participants showed an orienting response to the CS which habituated over trials. During conditioning, the control group (not pre-exposed) showed robust orienting to the CS, which declined over trials. The latent inhibition group (pre-exposed to the CS) showed a small recovery of orienting, but never really quite to the level being displayed by the control group.
Both groups showed a US expectancy conditioned response of looking into the area of the screen where the US was going to appear, with weak evidence that the pre-exposed group was less likely to exhibit this response. That response emerged over trials, and decreased during extinction.