CH 5: Visual Pattern Perception
Approaches to Shape & Pattern Perception
Shape- Area set off from the rest of a visual stimulus because it has a contour.
Form- An area set off from the surrounding space by its edges.
Shape constancy- Phenomenon in which a
CH 9: The Auditory System
The Auditory Stimulus
Pure tone- Tone that can be represented by a simple sine wave.
Cycle- For sound stimuli, a cycle is the full range of pressure changes from
normal, to high, to normal, to low, and back to normal.
Stabilized retinal images- an image that is kept on the same part of the retina through
various means. A stabilized retinal image will ultimately disappear, showing the
importance of change for perception.
-Using a computer display
-Showing subject sensat
CH 7: Color
Nature of Color
Color- a psychological reaction to wavelengths in the range of approximately 400 nm to
-Thus color exists only in the mind of the perceiver.
Hue- psychological reaction/ response of color that corresponds to the length
CH 8: Motion
Visual Perception of Real Movement
Optic flow field- the complex pattern on our retinas where peripheral objects
move more rapidly than central objects. The opic flow field is important for
Looming- A cue to time-to-contact
Lateral Inhibition & Mach Bands
Mach band- perceptual phenomenon in which bright & dark regions are perceived
within a single stripe, although there is no corresponding variation in the physical
distribution of light.
-first described by Ernst Mach in 186
10/29/12 12:51 AM
CH 6: Distance & Size Perception
Distance perception- your ability to perceive the distance relationships within
the visual scene.
Depth perception- perception of objects as three-dimensioned, having depth
Cones & rods are both differentially sensitive to light & differ in the speed with which
they adapt to changes in illumination.
Adaptation- in the context of light energy, adaptation is a change in sensitivity to a
CH 4: Basic Visual Functions
What do we need in order to see the word around us?
-Visual stimulation (energy from a small segment of the electromagnetic spectrum)
brought into focus on our receptors (retinas) by our cornea/ lens system.
-The process may s
CH 10: Basic Auditory Functions
Pitch Perception & Related Phenomena
Pitch- Psychological reaction that corresponds to the frequency of a tone.
Place theory- Theory of auditory processing that proposes that frequency
info is encoded at different places al