“Pattern recognition is so basic that the brain's pattern detection modules and its reward circuitry became inextricably linked. Whenever we successfully detect a pattern-or think we detect a pattern-the neurotransmitters responsible for sensations of pleasure squirt through our brains. If a pattern has repeated often enough and successfully enough in the past, the neurotransmitter release occurs in response to the mere presence of suggestive cues, long before the expected outcome of that pattern actually occurs. Like the study participants who reported seeing regular sequences in random stimuli, we will use alomst any pretext to get our pattern recognition kicks.

Pattern recognition is the most primitive form of analogical reasoning, part of the neural circuitry for metaphor. Monkeys, rodents, and birds recognize patterns, too. What distinguishes humans from other species, though, is that we have elevated pattern recognition to an art. "To understand," the philosopher Isaiah Berlin observed, "is to perceive patterns."

Metaphor, however, is not the mere detection of patterns; it is the creation of patterns, too. When Robert Frost wrote,

"A bank is a place where they lend you an umbrella in fair weather and ask for it back when it begins to rain"

his brain created a pattern connecting umbrellas to banks, a pattern retraced every time someone else reads this sentence. Frost believed passionately that an understanding of metaphor was essential not just to survival in university literature courses but also to survival in daily life.”