Tomaić, Tea.
(2018).
Hemispheric lateralization of sound duration perception.
Diploma Thesis. Filozofski fakultet u Zagrebu, Department of Psychology.
[mentor Salkičević, Svjetlana].
Abstract
Research of hemispheric lateralization shows well established differences for perception of rhythm, frequency and harmony, while perception of sound duration shows inconsistent results. Focus of this study was to explore hemispheric lateralization of sound duration perception in the situation when auditory stimuli are two sounds: one sound that represents danger (sound of siren) and other sound that doesn’t (sound of bell). 94 right-handed female students between ages of 19 and 27 participated in experiment. Obtained results partially confirm main hypothesis. For reaction time, there was significant interaction between target sound and target ear. Ear advantage depended on the sound, showing right ear advantage for the sound of siren, and left ear advantage for the sound of bell. Average number of correct estimations of sound duration showed advantage for the sound of bell. Reaction time was significantly faster for the sound of bell when estimations were given with right hand and presented to left ear. Participants gave statistically more correct estimations with right hand for bell sound presented to left ear, and with left hand for siren presented to left and right ear. Lateralization index showed small, but not significant advantage of left ear for average number of correct estimations. For reaction time significantly more participants showed right ear advantage, suggesting left hemisphere lateralization for sound duration perception. In conclusion, given measures of hemispheric lateralization of sound duration depend on type of a sound and are probably affected by interaction of different factors.
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