Motion Extrapolation in the Central Fovea
Identifieur interne : 002303 ( Main/Exploration ); précédent : 002302; suivant : 002304Motion Extrapolation in the Central Fovea
Auteurs : Zhuanghua Shi [Allemagne] ; Romi Nijhawan [Royaume-Uni]Source :
- PLoS ONE [ 1932-6203 ] ; 2012.
Abstract
Neural transmission latency would introduce a spatial lag when an object moves across the visual field, if the latency was not compensated. A visual predictive mechanism has been proposed, which overcomes such spatial lag by extrapolating the position of the moving object forward. However, a forward position shift is often absent if the object abruptly stops moving (motion-termination). A recent “correction-for-extrapolation” hypothesis suggests that the absence of forward shifts is caused by sensory signals representing ‘failed’ predictions. Thus far, this hypothesis has been tested only for extra-foveal retinal locations. We tested this hypothesis using two foveal scotomas: scotoma to dim light and scotoma to blue light. We found that the perceived position of a dim dot is extrapolated into the fovea during motion-termination. Next, we compared the perceived position shifts of a blue versus a green moving dot. As predicted the extrapolation at motion-termination was only found with the blue moving dot. The results provide new evidence for the correction-for-extrapolation hypothesis for the region with highest spatial acuity, the fovea.
Url:
DOI: 10.1371/journal.pone.0033651
PubMed: 22438976
PubMed Central: 3305323
Affiliations:
- Allemagne, Royaume-Uni
- Angleterre, Bavière, District de Haute-Bavière, Sussex de l'Est
- Brighton, Falmer, Munich
- Université Louis-et-Maximilien de Munich, Université du Sussex
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Le document en format XML
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A visual predictive mechanism has been proposed, which overcomes such spatial lag by extrapolating the position of the moving object forward. However, a forward position shift is often absent if the object abruptly stops moving (motion-termination). A recent “correction-for-extrapolation” hypothesis suggests that the absence of forward shifts is caused by sensory signals representing ‘failed’ predictions. Thus far, this hypothesis has been tested only for extra-foveal retinal locations. We tested this hypothesis using two foveal scotomas: scotoma to dim light and scotoma to blue light. We found that the perceived position of a dim dot is extrapolated into the fovea during motion-termination. Next, we compared the perceived position shifts of a blue versus a green moving dot. As predicted the extrapolation at motion-termination was only found with the blue moving dot. The results provide new evidence for the correction-for-extrapolation hypothesis for the region with highest spatial acuity, the fovea.</p></div></front><back><div1 type="bibliography"><listBibl><biblStruct><analytic><author><name sortKey="Krekelberg, B" uniqKey="Krekelberg B">B Krekelberg</name></author><author><name sortKey="Lappe, M" uniqKey="Lappe M">M Lappe</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Nijhawan, R" uniqKey="Nijhawan R">R Nijhawan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Nijhawan, R" uniqKey="Nijhawan R">R Nijhawan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Schlag, J" uniqKey="Schlag J">J Schlag</name></author><author><name sortKey="Schlag Rey, M" uniqKey="Schlag Rey M">M Schlag-Rey</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Ogmen, H" uniqKey="Ogmen H">H Ogmen</name></author><author><name sortKey="Patel, 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Aschersleben</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Shi, Z" uniqKey="Shi Z">Z Shi</name></author><author><name sortKey="Nijhawan, R" uniqKey="Nijhawan R">R Nijhawan</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Nijhawan, R" uniqKey="Nijhawan R">R Nijhawan</name></author><author><name sortKey="Wu, S" uniqKey="Wu S">S Wu</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Dassonville, P" uniqKey="Dassonville P">P Dassonville</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Nijhawan, R" uniqKey="Nijhawan R">R Nijhawan</name></author><author><name sortKey="Kirschfeld, K" uniqKey="Kirschfeld K">K Kirschfeld</name></author></analytic></biblStruct><biblStruct><analytic><author><name sortKey="Stevens, M" uniqKey="Stevens M">M Stevens</name></author><author><name sortKey="Yule, Dh" uniqKey="Yule D">DH Yule</name></author><author><name 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uniqKey="Nijhawan R" first="Romi" last="Nijhawan">Romi Nijhawan</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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