And this fact accounts for the chief characteristic difference between the natural and the hypnotic dream.

The former is complex, consisting of crowds of images, and continually changing: the latter is simple, limited, and persistent.

As Braid remarks, the peculiarity of hypnotism is that the attention is concentrated on a remarkably narrow field of mental images and ideas.

So long as a particular bodily posture is assumed, so long does the corresponding illusion endure.

One result of this, in connection with that impairing of sensibility already referred to, is the scope for a curious overriding of sense-impressions by the dominant illusory percept, a process that we have seen illustrated in the active sense-illusions of waking life.