Exploring the Underlying Mechanisms of the Oddball Effect

Jemma Rowlands (2010). Exploring the Underlying Mechanisms of the Oddball Effect Honours Thesis, School of Psychology, The University of Queensland.

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Author Jemma Rowlands
Thesis Title Exploring the Underlying Mechanisms of the Oddball Effect
School, Centre or Institute School of Psychology
Institution The University of Queensland
Publication date 2010
Thesis type Honours Thesis
Supervisor Derek Arnold
Total pages 60
Abstract/Summary This study examines the oddball effect – an illusion of time perception in which an oddball stimulus inserted into a train of temporally matched repeated stimuli appears to last for a relatively exaggerated amount of time (e.g., Eagleman, 2008; Rose & Summers, 1995). This study aimed to determine to what degree, if any, low-level sensory adaptation contributes to the oddball effect. It was predicted that low-level adaptation would not play a role in the oddball effect; rather that the effect would be driven by predictive coding. Two experiments were conducted; both manipulated the style of stimulus presentation (flickering or static) and the eye to which oddball stimuli were presented (same or different relative to other images). Experiment 1 used Troxler fading, which refers to fading with persistent viewing, as a measure of low-level sensory adaptation. These effects were shaped by the eye to which oddballs were shown, but not by the style of stimulus presentation. In contrast, in Experiment 2 it was found that oddball effects are insensitive to eye of origin, but are dependent on intermittent, flickering, stimulus presentations. Overall these data reveal a double dissociation, strongly suggesting that the oddball and Troxler fading effects rely on different causal mechanisms.

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Created: Wed, 06 Apr 2011, 10:05:54 EST by Lucy O'Brien on behalf of School of Psychology