Psychologists tend to explain the behaviors. The cognitive responses are studied by the psychologists who wish to find out reasons for complex cognitive responses. The emotional responses in a cognitive activity re very important. The cognitive behavior and its expression depends on the emotional responses as well. The brain responds to the environment by combining the responses to both the cognitions that are playing their parts in the response. For example, the people who are responding to a signal detection experiment, where they will be presented with ‘surprises’ by showing a different, or odd stimulus suddenly.