Mattias Ragnehed1, Stefan Stenfelt1, Ingrid Johnsrude, 1,2, Jerker Rnnberg1
Brain activity induced by auditory speech perception at different noise levels was captured by fMRI. The analysis revealed noise modulated activity in a number of relevant areas. In response to increased noise level reduced activity was found in auditory cortex and lingual gyrus whereas increased activity was observed in dorsolateral prefrontal cortex. This is in line with the idea that higher cognitive functions are engaged in order to extract the available lingual information in an degraded auditory signal.