The Psychological Review, Vol. 10 (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from The Psychological Review, Vol. 10

Psychological tradition is practically unanimous in distinguishing two fundamentally different conditions under which the perception of motion may occur. The one presupposes a relatively motionless eye, and offers sensory data composed exclusively of the displacement and modification of the retinal image. The other condition is characterized by certain forms of eye movement which are supposed to furnish perceptual data quite independent of all modification of the retinal image.

Concerning the exact form of the sensory data which operate under the former circumstances, there is less unanimity. For the purposes of our discussion it is sufficient to recall four main varieties. The most important of them all is generally held to be the simple displacement of the retinal image, when the consequent successive excitation of different local signs is supposed to condition an immediate perception both of the direction and of the extent of motion. This main angular displacement of the retinal image must be distinguished from a secondary angular displacement which was especially emphasized by Hoppe. The latter consists of irregular movements of the retinal image following the accidental variations which occur in the direction or velocity of most perceptible forms of objective motion.

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