Answer:
It is marked by a clinically significant disturbance in an individual's cognition.
Step-by-step explanation:
Cognition is the capacity an individual has of interpreting his/her environment by processing it via the brain in order to understand it. It is the way an individual processes information via his/her mental functions.
A psychological disorder tends to affect one's cognitive skills since in most cases there is a disturbance in the individual's reality and he/she is not able to process it. In this case, the individual's reality is distorted and his/her cognition is disturbed, as well as his/her emotion regulation and/or behavior.