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Paper   IPM / Cognitive / 14964
School of Cognitive Sciences
  Title:   Perceptual manifestations of auditory modulation during speech planning
  Author(s): 
1.  Y. Merrikhi
2.  R. Ebrahimpour
3.  A. Daliri
  Status:   In Proceedings
  Proceeding: SFN 2017
  Year:  2017
  Supported by:  IPM
  Abstract:
Previous studies have shown that auditory system's response to auditory stimuli is modulated (suppressed) during speech movement production in comparison to its response to identical stimuli during rest. In addition, in a series of electrophysiological studies, we have shown that the auditory system's response to stimuli is already suppressed during speech movement planning, well before movement production. Here, we examined the perceptual consequences of the suppression of auditory system during planning using a psychophysical paradigm. The study consisted of three conditions: Speaking, Listening, and Reading. In all three conditions, each trial started with a presentation of a plus sign in white characters. During the presentation of the plus sign, a standard auditory stimulus was delivered (75 dB SPL). Then, a target word in white color was presented. During the presentation of the word, a comparison auditory stimulus with varying intensity was delivered (70-80 dB SPL). Next, the color of the word changed from white to green. In the speaking condition, participants were instructed to produce the target words aloud, immediately after the word changed to green color. In the listening condition, participants listened to a self-produced version of the word, which was played immediately after the word changed to green color. In the reading condition, participants were instructed to silently read the target word. After the completion of the trial, participants were asked whether the comparison stimulus was louder or softer than the standard stimulus.Proportion of correct responses were calculated for each comparison level, condition, and participant...

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