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Sensation and Perception

A presentation for AP Psychology on Sensation and Perception

Jason Dreier

on 22 February 2012

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Transcript of Sensation and Perception

Sensation and Perception
Sensation - The process our body uses to get information from our surroundings
Perception - The process our body uses to interpret sensory information and translate it into recognizable, tangible information
Absolute Thresholds - The minimum stimulation necessary to detect a particular light, sound, pressure, taste, or odor FIFTY percent of the time.
Hearing Tests
Practical use
threshold tests for various things
Signal Detection Theory - the idea that we will detect a faint stimulus amongst background noise. It contradicts...
An example might be how a parent might hear their child's whimper even when exhausted, OR how a teen might hear their parents car pull in when they are misbehaving at home
Subliminal Messages are based on...

Subliminal - meaning that an individual is sensing something less than 50% of the time it is presented
How do they work?
Studies have shown that when a subliminal stimulus is presented, it can have an affect on how an individual perceives an event, image, person etc.
Subliminal messages have often been subject to quetion in regards to advertisements, but studies show that these advertisements are NOT powerful enough to have a LASTING effect on behavior
Besides, don't you think that your AP Psychology teacher would have used this many times in order to teach you more...faster?
make you think s/he is the COOLEST person in the world and con you into joining his/her personal army?
Difference Thresholds are the just noticable difference (jnd) between two stimuli
The jnd must differ by a constant proportion, known as Weber's Law, and this porportion varies based on the stimulus - essentially each sense has a different constant.
Sensory adaptation:
we have the ability to develop a tolerance to any given stimulus
That weird smelling house
The way your shirt smells after spending time in a smokey environment
The buzz of the lights
The stinky bf/gf
The fact is...we all are programmed to react to stimuli, especially that which is novel, or new.
We need to adapt to what is around us to stay alert - otherwise we would miss it, causing an evolutionary disaster
There are many practical and real world uses for thresholds, advertisements are successful because of them
We need to recognize that we sense what is around us but we perceive what or how is USEFUL for us
Full transcript