Curiosity has been described as a desire for
learning and knowledge, but its underlying mechanisms
are not well understood. We scanned subjects with functional
magnetic resonance imaging while they read trivia
questions. The level of curiosity when reading questions
was correlated with activity in caudate regions previously
suggested to be involved in anticipated reward. This
finding led to a behavioral study, which showed that subjects
spent more scarce resources (either limited tokens or
waiting time) to find out answers when they were more
curious. The functional imaging also showed that curiosity
increased activity in memory areas when subjects guessed
incorrectly, which suggests that curiosity may enhance
memory for surprising new information. This prediction
about memory enhancement was confirmed in a behavioral
study: Higher curiosity in an initial session was correlated
with better recall of surprising answers 1 to 2 weeks later