Shi, Zhuanghua; Nijhawan, Romi
Motion extrapolation in the central fovea.
In: PloS one 7(3), e33651
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.
|Faculties:||Psychology and Education Science|
Psychology and Education Science > Department for Psychology > General and Experimental Psychology
|Subjects:||100 Philosophy and Psychology > 150 Psychology|
|Footnote:||The present work was supported by German research foundation (DFG) project SH166|
|Deposited On:||03. May 2013 10:59|
|Last Modified:||29. Apr 2016 09:11|