Abstract
BackgroundDespite rapid developments in fMRI, there is still ongoing debate on the optimal paradigm for evaluating the level of auditory cortex activation.Material and MethodsA number of modern neuroimaging methods can be used to assess brain responses to acoustic stimulation, but new paradigms are still needed. Here the sparse fMRI approach is used to examine frequency-specific activation in auditory cortex in 12 normal hearing individuals.ResultsThe size of activation expanded with increasing sound intensity and decreasing sound frequency. At the same time, the main site of frequency-specific activation remained the same across intensities, indicating fixed tonotopic organization. The findings of the study are explained in terms of basilar membrane phenomena such as the travelling wave pattern and spread of activation.ConclusionsStimulation levels of at least 60 dB are necessary in order to obtain robust maps of group activation in auditory cortex.
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