Brain/Mind Separation

The Neuroscience of Tone Deafness: Scientific American: "This conclusion is strongly supported by the results of functional and structural neuroimaging experiments. In people with congenital amusia, frontal areas are more weakly coupled to posterior auditory areas. These findings thus suggest that the brains of people with amusia can detect discordant notes just fine – the people are simply not aware of it. Their brain knows but their mind does not.

Very similar effects have been observed in neuroimaging experiments of people with prosopagnosia. Normally, the activity of a brain area in response to a specific stimulus (such as a particular face) will decrease with repeated presentations, but will increase again in response to a new example from the same category (a new face). If the brains of prosopagnosics are really unable to discriminate between different faces then the increase in response to a new face should be absent. In fact, the “face areas” of prosopagnosics are still quite sensitive to differences in facial identity. What is different is that these responses are not communicated to areas in the frontal and parietal lobes, where conscious awareness is triggered.