Sensation and Perception - Ch 8

Affordance

information in the visual world that specifies how that information can be used

Akinetopsia (motion blindness)

a rare condition in which an individual is unable to detect motion despite intact visual perception of stationary stimuli, caused by damage to area MT

Anterior intraparietal (AIP) area

a region of the posterior parietal lobe involved in the act of grasping

Apparent motion

the appearance of real motion from a sequence of still images

Corollary discharge theory

the theory that the feedback we get from our eye muscles as our eyes track an object is important to the perception of motion

Correspondence problem (motion perception)

how the visual system knows if an object seen at Time 1 is the same object at Time 2

Focus of expansion

the destination point in an optic flow display, from which point perceived motion derives

Gradient of flow

the difference in the perception of the speeds of objects moving past us in an optic flow display

Induced motion

an illusion whereby one moving object may cause another object to look as if it is moving

Lateral intraparietal (LIP) area

an area of the primate parietal cortex involved in the control of eye movements

Medial intraparietal (MIP) area

an area of the posterior parietal lobe involved in the planning and control of reaching movements of the arms

Motion

a change in position over time

Motion aftereffect

a motion-based visual illusion in which a stationary object is seen as moving in the opposite direction of real or apparent motion just observed

Point light walker display

an experiment in which small lights are attached to the body of a person or an animal, which is then filmed moving in an otherwise completely dark environment

Real motion

motion in the world created by continual change in the position of an object relative to some frame of reference

Reichardt detectors

neural circuits that enable the determination of direction and speed of motion by delaying input from one receptive field, to determine speed, to match the input of another receptive field, to determine direction