Nielsen, Andreas Brinch Hansen, Lars Kai Kjems, UĪ sound classification model is presented that can classify signals into music, noise and speech. The present results suggest some differences in the attentional selection of sounds on the basis of their location and pitch consistent with the suggested auditory "what" and "where" processing streams. Attention to location but not to pitch produced a significant increase of activation in the premotor/supplementary motor cortices of both hemispheres and in the right prefrontal cortex, while no area showed activity specifically related to attention to pitch. These activations were stronger during attention to location than during attention to pitch. Attention to either sound feature also activated prefrontal and inferior parietal cortical regions. Both attention to location and attention to pitch produced enhanced activity (in comparison with activation caused by the same sounds when attention was focused on the pictures) in widespread areas of the superior temporal cortex. In the Attend Pitch conditions, sounds of randomly varying pitch ( high or low) were presented at a constant location (left or right).
In the Attend Location conditions, the sound location varied randomly (left or right), while the pitch was kept constant ( high or low). In different tasks, the subjects (N = 10) attended to a designated sound location or pitch or to pictures presented on the screen. We used 3-T functional magnetic resonance imaging to compare the brain mechanisms underlying selective attention to sound location and pitch. Selective attention to sound location or pitch studied with fMRI.ĭegerman, Alexander Rinne, Teemu Salmi, Juha Salonen, Oili Alho, Kimmo
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