Second, it is unclear to what degree this rapid learning is speechspecific
or whether it could be a general auditory learning mechanism.
Although fast auditory perceptual learning effects were observed at
both neural and behavioural levels after a short training, they were
not found in passive exposure (Näätänen et al., 1993; Atienza et al.,
2002). More specifically, no rapid learning correlates were found
for non-speech signal-correlated noise stimuli in passive listening,