1.   All the evidence points to dreaming being a highly complex cognitive activity.

2.   Any cognitive activity seems to be dominated by the perceptual aspects.

3.   Behavior patterns that are repeated in the course of cognitive activity are conceptualized as reflecting schemata.

4.   The inability to reverse operations is characteristic of the cognitive activity of the preoperational child.

5.   The researchers found an inverse correlation between the frequency of cognitive activity and the risk of developing the disease.