Human beings have evolved two distinct systems for processing information. The first, the explicit system, is rule-based, can be expressed verbally, and is tied to conscious awareness. When the prefrontal cortex is fired up, the explicit system is usually turned on. But when the cold calculus of logic is swapped out for the gut sense of intuition,

The human mind perceives, forms concepts, learns, makes judgements, feels emotions, uses language, remembers, invents, dreams, desires. How can so much complexity be captured in a single image? Clearly, some aspects of mental life must be prioritised at the expense of others. But which ones? And after those choices have been made, does the 'picture

Yet the contents of our hidden depths seem to remain perpetually elusive. Freudian psychoanalysts can speculate about our hidden fears and desires; psychologists and neuroscientists can attempt to draw subtle and highly indirect conclusions from actions, heart-rate, skin conductance, pupil dilation and the rate of blood flow in the brain. But no hi