Bottom-up effects modulate saccadic latencies in well-known eye movement paradigm
| Autor: | Saskia van Stockum, Michael R. MacAskill, Tim J. Anderson |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Adult
Male genetic structures media_common.quotation_subject Experimental and Cognitive Psychology behavioral disciplines and activities Task (project management) Young Adult Discrimination Psychological Arts and Humanities (miscellaneous) Perception Task Performance and Analysis Developmental and Educational Psychology Reaction Time Saccades Humans Attention media_common Communication Analysis of Variance business.industry Eye movement Cognition Stimulus onset asynchrony General Medicine Saccadic masking Symbol Saccade Female Cues Psychology business Neuroscience psychological phenomena and processes Photic Stimulation |
| Zdroj: | Psychological research. 75(4) |
| ISSN: | 1430-2772 |
| Popis: | A well-known eye movement paradigm combines saccades (fast eye movements) with a perceptual discrimination task. At a variable time after the onset of a central arrow cue indicating the target direction [the stimulus onset asynchrony (SOA)], discrimination symbols appear briefly at saccade target and non-target locations. A previous study revealed an unexpected effect of SOA on saccadic latencies: latencies were longer in trials with longer SOAs. It was suggested that this effect reflects a top-down process as observers may wait for the discrimination symbol to appear before executing saccades. However, symbol onsets may also modulate saccade latencies from the bottom-up. To clarify the origin of the SOA effect on latencies in this paradigm, we used a simplified version of the original task plus two new symbol onset conditions for comparison. The results indicate that the modulation of saccadic latencies was not due to a top-down strategy, but to a combination of two opposing bottom-up effects: the symbol onsets at the target location shortened saccade latencies, while symbol onsets at non-target locations lengthened saccade latencies. |
| Databáze: | OpenAIRE |
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