Date of Award


Degree Type


Degree Name

Master of Arts




Dr. Eric Buckolz


Inhibitory after-effects (IAEs) arise when prior acts of inhibition interfere with current related processing. Such after-effects arise at central, distracter-occupied locations when all locations are central (pure), but not when central and peripheral event positions are mixed within a trial series. An explanation for this result, tested here, was that a single distracter presentation in mixed, but not pure, designs causes the formation of an inhibitory net vector that becomes the centre of inhibition, and which points midway between the two potential locations (central/peripheral) on the distracter side of midline. The predicted decrease in inhibitory after-effect size for the mixed, relative to the pure, condition was supported; indicative of inhibitory net vector involvement, while also extending the net vector model proposed by Klein et al. (2005). Unexpectedly, inhibitory after-effects were produced in the pure central condition, precluding a test of why it appears in mixed designs.



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