And, as Dr Okubo points out, some of these areas are also associated with theory of mind.

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After Shin-Okubo comes Shinjuku, the west side's big divider in terms of wealth and prestige, especially among younger, fashion-conscious Tokyoites.

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Prosecutors may present more details of Mr Okubo's case in June, after which the options for Mr Ozawa may narrow.

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It is surely no coincidence that much of the activity Dr Okubo found is in that characteristically human part of the brain, the enlarged cerebral cortex, rather than in the limbic system.

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Yoshito Okubo was guilty of a bad miss early on before Tamada showed his strike partner the way, sliding in to fire home a right-wing cross from Makoto Hasebe in the 21st minute.

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"Bringing in someone young or from the private sector was probably very difficult as the Finance Ministry has to deal with all sorts of vested interests and you want someone with experience, " said Takuji Okubo, senior economist at Goldman Sachs in Tokyo.

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