4. Modulation of auditory cortex attention effects with increasing sound
4.5 Conclusions
The main focus of the present studies was on attention-related processing in the auditory cortex. As expected, it was found that activity in the auditory cortex is strongly modulated by selective attention. In addition, the present results suggest that the amplitude of attention-related activity in the auditory cortex increases with presentation rate of attended sounds.
These results emphasize the importance of controlling for both attention and stimulation rate in studies of auditory processing. Importantly, the present studies could not reliably separate pitch-related and location-related attention effects in the auditory cortex. This suggests that attention-related processing of sound identity and location may not be segregated in the auditory cortex. However, there appears to be enhanced attentional processing of sound location in the temporo-parietal junction and areas of the frontal cortices. In addition, a study on bimodal attention found that activity in the auditory cortex was more prominent during audiovisual attention than during auditory or visual attention.
This result suggests that audiovisual attention utilizes a multisensory representation in the auditory cortex. Taken together, results of the present studies contribute to the knowledge about rate-dependent, feature-specific and integrative attention-related functions in the auditory cortex.
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