Number, space and time
According to Kant, number, space and time provide “a priori intuitions” that precede and structure how we experience our environment. How does the brain process these dimensions? One recent suggestion is that a common magnitude system in the parietal lobes processes all three. Another has been that number magnitude is represented spatially in terms of a mental number line. Here I describe some research from our lab calling into question these proposals, and suggest that number is processed by an independent neural system.