“Several studies report impairment in reasoning accuracy as a consequence of lesions in the left hemisphere,237 but others report impairments in reasoning following right hemisphere damage that are in reality more of a handicap. That’s because they involve not just hypothetical logical problems, but inferring complex and ambivalent or implicit meaning, inferring what is going on in another person’s mind and knowing how to understand the situation as a whole. As I have repeatedly emphasised, the old dichotomy – left hemisphere rational, right hemisphere emotional – is profoundly mistaken, on both counts; not to mention the fact that reason and emotion are never entirely separable. Knowing the limits to reason is essential to understanding. If not coupled with contextual, implicit and intuitive understanding (in none of which the left hemisphere excels), it can magnify error. As Sass and Pienkos point out: ‘The most deluded patients with schizophrenia tend to be those whose thinking is more logical.’238 This is in line with Eugène Minkowski’s insight that the problem in psychosis is not loss of reason, but its hypertrophy: ‘The mad person is much less frequently “irrational” than is believed: perhaps, indeed, he is never irrational at all.”