Term

Why do the eyes move?

Definition

Vision is an active process • Eye movements compensate for narrow field of vision Image stabilisation • If a visual target is moving Information acquisition • Humans move their eyes while examining objects and scenes

Term

Perceiving the environment: Selective attention

Definition

Some aspects of environment are more important and interesting than others. • Visual system has evolved to operate in this fashion • Too much incoming stimulation at retina to process everything. • Selection is achieved partially through use of fovea

Term

How is Selective Attention Achieved?

Definition

Scanning a scene - eye movements can take in different parts of a scene Measuring eye movements with eye trackers • Saccades - small, rapid eye movements • Fixations - pauses in eye movements that indicate where a person is attending • Approximately three fixations per second