sensation and perception Flashcards
define bottom up theories.
-perception starts with physical characteristics of stimulus and basic sensory processes.
define top down theories.
- perception is driven by high level cognitive processes, existing knowledge, prior exceptions.
- work down to actual stimulus.
name the four theories associated with bottom up theories.
- direct perception
- template theories
- feature matching theories
- recognition by components
which theory involves more high level processing?
top down.
what part of the brain is devoted to perception?
cereal cortex.
what is the difference between the absolute threshold and differential threshold?
absolute threshold is the measure of the smallest amount of stimilus energy required for a subject to detect its presence, whereas differential threshold is the measure of the smallest change in stimulus level required for subject to discriminate direction of change.
define what is meant by parallel processing.
processes can take place at different places at the same time.
define what is meant by serial processing.
processes take place one thing at a time.
name the fundamental concepts of sensation and perception.
sense organ.
sensory pathways.
brain.
define transduction.
conversion of environmental energy to nerve signals.
identify methods of studying perception.
- staining
- singe cell recording
- fMRI
- lesions / neuropsychology
- psychophysics
how is single cell recordings carried out?
neurons recorded with micro-electrode inserted close to cells, use epilepsy patients.
describe how vertical lesions are carried out.
pulses of magnetic energy disrupt activity in area od the brain, see consequence.
