Found an interesting blog entry on conference proceedings on hearing, speech and the brain.
The influence of background noise (continuous scanning) shouldn’t be
underestimated. If background noise simply increases global brain
signal (i.e. an increase in gain), it shouldn’t have impacted the
results. But background noise can interact with behavioral factors, and
results in spatially constrained patterns of univariate signal increase
(including left temporal cortex, e.g. Peelle et al. 2010b).