A common psychological phenomenon is the severe clouding of autobiographical memory, which results in the overgeneralization of memories. For instance, clinically depressed individuals, schizophrenic individuals, and those suffering from obsessive compulsive disorder tend to recall many memories that lack detail (clouded) and are much more schematic than typical autobiographical memories. In these instances, a patient asked to recall specific memories of his father could only recall general events such as "walks in the park after Sunday lunch" and was unable to generate a single specific memory of a single walk.