On the superiority of visual processing in spatiotopic coordinates
| Autor: | Alon Mann, Ilana Naveh, Ehud Zohary |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Adult
Male genetic structures Computer science media_common.quotation_subject Stimulus (physiology) Frame of reference 050105 experimental psychology Retina Visual processing 03 medical and health sciences Young Adult 0302 clinical medicine Spatial Processing Perception Psychophysics Reaction Time Humans 0501 psychology and cognitive sciences Computer vision Attention media_common business.industry 05 social sciences Gaze Sensory Systems Goal attainment Straight ahead Ophthalmology Female Artificial intelligence Visual Fields business 030217 neurology & neurosurgery |
| Zdroj: | Vision research. 150 |
| ISSN: | 1878-5646 |
| Popis: | Organisms exploit spatiotemporal regularities in the environment to optimize goal attainment. For example, in experimental conditions, repetition of a stimulus at the same position speeds up response time. A recent study reported that this spatial priming occurs even when the eyes move between trials, indicating that the target is encoded in spatiotopic coordinates (Attention, Perception & Psychophysics 78, (2016) 114-132). However, in that study, the relevant position of the repeated stimulus eliciting spatiotopic priming, was always at the screen center. Using a similar paradigm, we find that reaction times for screen-centered targets are markedly shorter than for retinally-equidistant target positions. When this center preference is taken into account, the alleged spatiotopic priming effects are dramatically reduced, though not totally eliminated. In a second experiment, we show that the preferred central stimulus position is encoded in allocentric coordinates (e.g. screen position) rather than in an egocentric frame of reference (e.g. straight ahead). The better performance at the screen center, irrespective of gaze direction or seating position, is likely to reflect an optimal choice for the allocation of spatial attention. |
| Databáze: | OpenAIRE |
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