Natural selection awards no prize for second place. - Thomas Lewis

When people have trouble with their emotions – a bout of anxiety or depression, say, or seasonal gloominess - they often want science to pinpoint an offending neurotransmitter in the way that a witness picks the perp out of a lineup. Is it excessive norepinephrine, too little dopamine, errant estrogen? The answer is apt to dissatisfy: no single suspect can be fingered with confidence because the question itself attributes a fallacious simplicity to the brain.

Loving is limbically distinct from in love. Loving is mutuality ; loving is synchronous attunement and modulation. As such, adult love depends critically upon knowing the other. In love demands only the brief acquaintance necessary to establish an emotional genre but does not demand that the book of the beloved’s soul be perused from preface to epilogue. Loving derives from intimacy, the prolonged and detailed surveillance of a foreign soul.

a mood is a state of enhanced readiness to experience a certain emotion. Where an emotion is a single note, clearly struck, hanging for a moment in the still air, a mood is the extended, nearly inaudible echo that follows. Consciousness registers a fading level of activation in the emotion circuits faintly or not at all. And so the provocative events of the day may leave us with emotional responsiveness waiting beneath our notice. If a man spills coffee on himself, his annoyance is relatively short-lived — on the order of minutes. After the conscious feeling is gone, residual activity in the anger circuits lingers. He will pass into an irritable mood — a quickness to anger, the only reflection of the waning activity in those circuits.