CIS 3365 Lecture Notes - Lecture 14: Iconic Memory, Saccade, Cognitive Load

• School: University of Houston
• Department: Computer Information Systems
• Course: CIS 3365
• Professor: Xuqing Wu

Document Summary

Visual attention is the process of seeking our visual stimuli and then focusing on them. We do not perceive much if we do not have at least some expectation or need to see it. We perceive visual objects (next week"s topic), not light pixels (nb: gibson"s theories of last week!) Searchlight model of attention: useful field of view (ufov) is the area where we can rapidly take in information (1-15 , size depends e. g. on the target density) As cognitive load goes up, ufov shrinks (tunnel vision) Eye movements and visual attention are somehow related. Attention can be attracted with motion, salient features (maybe later lectures) The eye moves according to three basic strategies: Eye movements consist of fixations (duration 0. 2-0. 6 s), during which eye is relatively stable. Eye moves from fixation to fixation with saccades (duration 0. 02-0. 1 s, velocities up to 900 /s). Saccadic movements are pre-programmed (ballistic). we are practically blind during the saccade (saccadic suppression).