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psych U4M16

sensation and perception

QuestionAnswer
sensation stimulation of sensory receptors and the transmission of sensory info to the CNS (automatic) (receiving stimulation)
psychophysics the relationship between physical stimulation and psychological effects.
how does the energy of an action get to the CNS? energy>receptor cell>transduction>neural impulse>CNS
transduction converting stimulus into electrochemical energy
what can psychophysics be affected by? culture
perception how we interpret our sensations
bottom-up processing recognize an object by its component parts; relies on sensory receptors
top-down processing identify by brain recognition; EXPERIENCE
do young people do more bottom-up or top-down processing and why? more bottom-up because they don't have enough experience, and top-down relies on experience
how does perception develop? through learning and experience
what are the different types of selective attention? filter theories, attentional resource theories, inattentional blindness, and change blindness
filter theories things that pass through at a higher level than our receptors to get attention such as your name, alarms, aroama
attentional resource theories only a fixed amount of attention divided up as required in a situation
inattentional blindness failing to see visible objects when attentionis directed elswhere (mgi
change blindness failing to notice change in the environment.
absolute threshold the minimum intensity to produce a sensation (50% of the time)
difference threshold minimum amount of difference that can be detected between 2 stimuli (it must affect receptor cells 50% of the time)
another name for difference threshold JND=just noticeable difference
weber's law the greater the stimulus, the larger the difference must be to be noticed
sensory adaption the unconscious temporary change to environmental stimuli; automatic process in our senses
what are we more sensitive to low levels of stimulation
what are we less sensitive to constant stimulation and when overall stimulation is high
habituation proceses by which we become used to stimuli
example of habituation clock ticking, AC (you can choose to be conscious, but also become unconscious)
dishabituation change in the stimulus or our change in awareness causes us to notice it again
example of dishabituation if misty is laying on my stomach and she stands up then that is dishabituated. btw you can't have dishabituation without habituation. you have to get used to it so it can be unnoticed.
receptive field area from which our receptor cells receive input
examples of what receptor neurons are designed to respond to the environment; ears respond to soundwaves, eyes respond to lightwaves
sensory coding process where receptors convey a range of info to the brain
if there is more pressure or area involved in the sensation, then... there are more neurons firing, firing rapidly
single-cell recording the measuring of firing rate and pattern of receptor cells in response to varying sensory input
spacial and temporal part of single-cell recording how many fire; pattern of firing
signal detection theory distinguishing stimulus by its intensity and the our physical state (setting, mood, motivation, experience)
examples of signal detection theory being able to focus on studying with loud background noise, ability to tell if cooking needs more sweet/saltiness
Created by: allyson.lee