List of Articles MohammadAli Nazari

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  1 - Stimulus Repetition and Time Perception: Repetition Priming or Repetition Suppression?
  hassan sabourimoghaddam MohammadAli Nazari   حسین سپاسی مقدم
  Repetition priming and repetition suppression are two phenomena that both are caused by repeated exposure to an identical stimulus. Repetition priming usually is under- lined by improved behavioral performance, whereas in timing, the repetition suppression is accompanie More

  Repetition priming and repetition suppression are two phenomena that both are caused by repeated exposure to an identical stimulus. Repetition priming usually is under- lined by improved behavioral performance, whereas in timing, the repetition suppression is accompanied by increasing error in time two estimations. This study investigated the possible simultaneous concurrence of these phenomena. Twelve adult subjects participated in a temporal oddball task in which the repetition of standard stimuli was under experimental manipulation, compard to the target stimulus. Both changes in performance and time representation were analyzed by a repeated measure within group design. Repeated presentations of temporal stimulus either in visual or auditory modalities improved participants behavioral performance (repetition priming). At the same time, data analysis for time representation showed that despite different directions in the modalities, the oddball stimulus was able to distort the time representation, both in time contraction and time expantion. The findings proposed that although the repetition priming can lead to faster and more accurate response, but more time distortions after repeated stimuli can be explained by the shift occured in errors distribution. Manuscript profile
• Open Access Article
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  2 - Attenuating the Effect of Sensory Modality on Time Perception
  MohammadAli Nazari hassan sabourimoghaddam Reza khosrowabadi Hossein Sepasi Moghaddam Seyed Shahriar  Arab
  20.1001.1.10199616.1398.22.2.1.6
  In psychophysics domain, various factors have been studied as the main account of the time contraction after stimulus repetition and the time expansion after a novel stimulus; however, there is no clear explanation about the amount of involvement of temporal and non-tem More

  In psychophysics domain, various factors have been studied as the main account of the time contraction after stimulus repetition and the time expansion after a novel stimulus; however, there is no clear explanation about the amount of involvement of temporal and non-temporal features. In this study, 48 sub-jects participated in 3 experiments in which the purer role of temporal properties of stimului were examined. Data were provided by a tem-poral oddball paradigm and the analysis was implemented by repeated measures analysis of variance in experiments 1 and 3. In experiment 2, a psychometric function was used to deter-mine the modified estimations in temporal pro-cessing system. Findings showed that despite removing the non-temporal change in expe-riment 1, the temporal change between repea-ted/non-repeated stimuli can produce time con-traction and dilation respectively. The result was only for the auditory system. In experi-ment 2, an efficient threshold for temporal oddball was suggested. Using the updated threshold, experiment 3 revealed concordant repeated/non-repeated effects on time percep-tion in both modalities. Manuscript profile