blackford, allen, cowan, and avery (2012) compared the effect of an extremely inhibited temperament and an extremely uninhibited temperament on habituation. their study found that over repeated presentations individuals with an uninhibited temperament demonstrated habituation in both the amygdala and hippocampus, whereas participants with an inhibited temperament demonstrated habituation in neither brain region. the researchers suggest that this failure to habituate reflects a social learning deficit in individuals with an extremely inhibited temperament, which is a possible mechanism for a higher risk of social anxiety.