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Lecture 6

Lecture Note and Textbook Notes for lecture 6/chapter 6 (and 7)

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University of Toronto Scarborough
Matthias Niemeier

PSYB51 - Perception Lecture Slides Textbook Notes Lecture 6 Eye Movements - 6 muscles are attached to each eye and are arranged in three pairs, which are controlled by an extensive network of structures in the brain: o Inferiorsuperiorlateralmedial rectus o Inferiorsuperior oblique - Controlled by 3 cranial nerves - Superior colliculus: structure in the midbrain that plays an important role in initiating and guiding eye movements - When stimulated with electrical signals, eye movements can be observed - Movements: o Smooth pursuit: eyes move smoothly to follow moving object o Saccade: rapid movement of eyes that change fixation from one object or location to another; we make saccades in order to bring text into our fovea; no information is processed during o Vergence eye movements: type of eye movement in which two eyes move in opposite directions, done deliberately o Reflexive eye movement: automatic and involuntary eye movement Vestibular eye movements: when the eyes move to compensate for head and body movement while maintaining fixation on a particular target Optokinetic nystagmus: eyes involuntarily track a continuously moving object o Fixational eye movements, microsaccades - Function of smooth pursuit eye movements: to keep the object of interest stable and on the fovea - Why do we perceive the pencil to be in motion in the first case, but perceive the dot to be stationary in the second case? o Because in one case there is an eye movement - Similar effects can be observed with saccadic eye movements - Function of saccades: to move (rotate) the fovea to the object of interest, to move as quickly as possible to reduce travel time during which vision is blurred - Yarbus (1967) scanpaths reveal intentions and interests - 3-4 saccadessecond - False motion and retinal smear during saccades
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