Object recognition was studied by combining a continuous presentation paradigm and event related potentials (ERPs). Using the Random Image Structure Evolution program (RISE), the phase spectrum of object images was parametrically altered to produce a set of continuous noise-to-object sequences. The RISE technique controlled for the low level visual properties of the object image (i.e., luminance, contrast, spatial frequency). Although the stimulus transformation proceeded continuously and smoothly, perceptually, participants reported the abrupt onset of object recognition, distinct from noise, at a critical frame in the sequence. During electrophysiological recording, the critical onset frame was marked by increased activity in posterior-occipital and central-parietal components between 152 and 324 ms post stimulus onset of the critical frame. More broadly, this study also highlights the strength of the continuous presentation paradigm for investigating object adaptation effects with ERPs.
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/1995 |
| Date | 17 December 2009 |
| Creators | Piatt, Carley Graceanna |
| Contributors | Tanaka, James William |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | Available to the World Wide Web |
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