The Importance Of The Secondary Modality ( Auditory )

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Participants 20 [right-handed] healthy adults (7 females; mean age of 23.6 years; 19-34 years range) participated in the study after giving written informed consent as approved by [University, Program]. Each participant had normal or corrected to normal vision and normal hearing. None of the subjects had current or prior neurological or psychiatric illnesses. Task and Procedure Essential idea in this study is to pin down the role of the secondary modality (auditory) in a particular percept (of timing) of another primary modality (visual) by systematically varying the a property (stimulus onset) of the secondary modality as a factor, while keeping stimulus in the primary modality same. Therefore, this study focuses on the perceived time of a visual event, since only one flashing bar was shown as the primary modality. As for the secondary modality, physical time onsets of the clicks were modulated, as shown in [figure 01-design]. In the time course of a trial, a visual bar was flashed either to left or to right of a central fixation point as visual event. In order to keep the attention of the participant in the task, participants were requested to indicate the location of the bar (forced-choice task) whenever they see one, by a key press. Reaction times of participants were an indicator of the timing of the perception, therefore participants were also asked to respond as fast as possible without making errors. Besides visual bar, a brief static click was introduced through
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