Thesis (Ph.D) - University of Birmingham, School of Psychology, Faculty of Science.
|Statement||by Louise Alston.|
In support of this, subitization of static items improved as the movement speed of the distracters increased. The data suggest that the processes supporting subitization are highly sensitive to dynamic stimuli and depend on the ease of segmentation between static and moving by: The general formula for the Gabor stimuli was as follows: L (x, y) = L m [1 + sin (2 π xf s + ϕ)] × exp [-(x 2 + y 2) / (2 σ 2)] Dynamic stimuli were identical to static stimuli in every respect except that the sine wave function was temporally modulated, creating an associated translation of the grating within the Gaussian by: Timing studies have reported a lengthening of the perceived time for moving as opposed to static stimuli and for stimuli of higher as compared to lower amounts of implied : Jennifer Freyd. The different sensitivities of these two types of channels are held to be responsible for the difference between the CSF obtained with static stimuli and that obtained with temporally modulated or moving patterns (Robson, ): in particular, the sensitivity of the transient channels reduces or abolishes the low spatial-fre- quency cut in the.
Subitizing is studied using habituation and familiarization, visual expectation and enumeration paradigms. In the habituation paradigm changes in viewing time are considered a measure of habituation to repeated presentations and dishabituation to novel stimuli. Initially a certain stimulus is being presented until the infant's attention wanes, recording the total viewing time. Browse book content. About the book. Search in this book. paradigm, in which covertly attended, static, visual-target stimuli that are superimposed on a globally moving array of distractors perceptually disappear and reappear. subitization, visual search, multiple object tracking, working memory) showing that N2pc amplitude covaries. Infants' looking times to both types of outcome were measured. (Wynn, a) reports that in both addition and subtraction conditions infants looked significantly longer at the unexpected events. this book may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, or otherwise, without prior written permission of the authors. This book is a pre-release version of a book in progress for Oxford University Press.
A number of psychophysical studies have shown that moving stimuli appear to last longer than static stimuli. Here, we report that the perceived duration for slow moving stimuli can be shorter than for static stimuli under specific circumstances. Observers were tested using natural movies presented at various speeds (× = static, × = slow, or × = fast, relative to original speed. Static stimuli implying motion (e.g., an image of a hand dropping a mug) have been found not only to lead to RM effects (Freyd ; Freyd et al. ) but also to significantly increase metabolic. First, the authors replicated earlier findings. Subjects adapted to two moving gratings placed on either side of fixation, and brain activity was measured with functional MRI (fMRI) in a delayed test phase when two static gratings were ty in V5/MT was elevated when an MAE was perceived (after adaptation to unidirectional motion), compared to a control condition when no MAE . Moreover, V1–TMS induced a temporally unspecific interference with visual processing as it impaired the processing of both motion and static stimuli at the same delays. These results are in accordance with fast moving stimuli reaching V5 through a different route than slow moving stimuli.