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Mod 20

Basic concepts of sensation and perception

Sensation How our sensory receptors receive and represent stimuli from the environment (Brought in from your 5 senses )
transduction Process by which sensory information is interpreted by the brain -Conversion of one form of energy to another
Perception Process of organizing and interpreting sensory information. How your brain makes sense of stimuli (Varies by person)
Bottom-Up Processing Starting with the sensory input, the brain attempts to understand/make sense
Bottom-Up Processing Example “This creature is long, skinny, and slithering. This is a snake!”
Top-Down Processing guided by experience and higher-level processes, we see what we expect to see
Top-Down Processing Example Jumping because you see a stick by the side of the path that looks like a snake
Selective Attention tendency to focus on just one particular stimulus
Inattentional Blindness you don’t notice other stimuli
Cocktail party effect We attune to words that sound similar to our name (“Actually” for “Ashley”)
Selective attention is proof we are not really good at multitasking--we are missing something
Change Blindness Not noticing a change in the visual environment
Absolute Threshold The minimum stimulation needed to detect a particular stimulus is 50 percent of the time.
Difference Threshold The minimum difference between two stimuli required for detection 50 percent of the time. (just noticeable difference (JND)
Weber’s Law To be able to tell the difference between degrees of stimulation, two stimuli must differ by a constant minimum percentage.
Signal Detection Theory Predicts how and when we detect the presence of a faint stimulus amid background stimulation
Signal Detection Theory Depends on Strength of the signal /Our psychological state at the time
Subliminal stimuli Not detectable 50% of the time. They are below your absolute threshold /Can result in priming
Priming the activation, (often unconsciously), of certain associations, thus predisposing one’s perception, memory, or response.
Sensory Adaptation diminished sensitivity to stimuli as a consequence of constant stimulation.
Created by: Sophia154
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