Children 6–12 years old are instructed to press the responder button when a grey circle appears and not to press when a grey circle with a cross in it appears. Clients 12–60 years old receive a more cognitive challenging task, where they are instructed to press the responder button each time a symbol with the same shape and color is repeated on the screen. When the test is finished the result is compared with an age and gender adjusted norm group. Another CPT, the Immediate and Delayed Memory Task is a computer administered test that involves the rapid presentation of 5-digit number. Successful identification of consecutive matching 5-digit numbers are interpreted as representing attentional capacity. However, this task also includes "catch" trials in which consecutive stimuli match on 4 out of 5 digits, responses to which are interpreted as impulsive. The use of these catch stimuli results in a higher base rate of commission errors, which may be necessary for testing impulsivity in higher functioning or adult populations. While scoring varies from test to test, there are four main scores that are used. A client's scores are compared with the normative scores for the age, group and gender of the person being tested.