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35 Cards in this Set

  • Front
  • Back
Environmental stimulus
All of the things in our environment that we can potentially perceive
Attended stimulus
part of environmental stimulus, focuses attention on this stimulus
Stimulus on receptors
attended stimulus excites receptors
transformation of one form energy to another, environmental energy transformed to electrical, image on retina generates electrical signals in the eye
processing of electrical signals by neurons
conscious sensory experience, electrical energy transforms in brain to some experience
identifying the experience as smth known/familiar
goal of perception, eye movement leads to new attended stimulus
affects processing, perception and recognition
Bottom up processing
starting from stimulus toward perception
Top down processing
starting from knowledge
Psychophysical approach
relationship between stimulus and perception
Physiological approach
relationship between processes within person and perception
Name processes of psychophysocal approach
description, recognition, detection, magnitude , search
describing experience, phneomenological method
stimulus is presented, subject has to recognize it, used by physicians, qualitative
detecting absolute threshold
Absolute threshold
smallest amount of stimulus required to generate detectable perception
Difference threshold
smallest difference between 2 stimulus that a person can detect
Name methods of measuring absolute threshold
method of limits, adjustment, constant stimuli
Method of limits
present stimuli in ascending/descending order
Method of adjustment
subject controls the strength of stimulus
Method of constant stimuli
presents stimuli of random strength in random order
Weber law
K = difference threshold/standard weight
Magnitude estimation
present subjects with different strength stimuli at random. Ask them to number strength of perception, plot to estimate magnitude
Formula for perception
P = KS^n, S- stimulus strength
What did Johannes Mueller discover at mid 19th century
showed electrical energy flows down the nerve
hemoglobin has iron, if presented with magnetic fields they line up like tiny magnets to indicate volume of blood flow.
Selective adaptation
if stimulated by the same stimulus, for a long time, sensitivity decreases
Simple cells
orientation sensitive, cylindrical shape, excitatory center, inhibitory surround, edge detectors
Complex cells
orientation sensitive, non linear never respond to stationary spot, difficult to find their receptive field . Respond to moving lines, depend on direction of movement
End stopped cells
far more specific, specific length, orientation, size
What did Hubel and Weisl do
won Noble prize for discovery of cortical cells
What is responsible for focusing ability
cornea - 80, lens - 20