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Altered Egos by Todd Feinberg, Oxford, £14.99, ISBN 019513625X

ONE way to understand something is to see what happens when it breaks. And
New York neurology professor Todd Feinberg certainly sees a lot of broken brains
in his line of work.

“Rosamond B” sits meek and grandmotherly in his office until he hands her a
mirror. The sight of her reflection throws her into a state of murderous fury.
She leaps up screaming: “That’s her, that’s her!” —the stranger, the old
hag, who is dogging her footsteps, persecuting her at every turn. Altered Egos
offers us a dazzling array of…

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