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Lecture 11

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University of Toronto Scarborough
Steve Joordens

Lecture 11 Introduction  Weber and Fechner interested in psychophysics  There are all these signals and frequencies of information and with the right transmitter or receiver you can turn it into something that can fit our mind o How does this information get into our brain and how are those representations stored and used?  Weber mainly on just noticeable differences o Holding weights example o How much of a perceptual difference can we perceive  Sensitivity o Weber was interested in a difference threshold, but now its about absolute threshold o Threshold - Something that separates two states  I.e. Man picks up women and carries her through this threshold and change of state b/c change from being single to married o Absolute Threshold - Changing from a state of you see it hear it and feel it to you don't see it, don't hear it and don't feel it  Subliminal Perception o Idea that you have a conscious and unconscious mind, and if you have a bad habit, if one can talk to unconscious mind, one can make it change its ways easier than talking to conscious mind o Limn - Point where you can see something or hear something or feel something 50% of the time o Subliminal - present it with an energy level less than 50% that you can't feel or hear or see so that only subconscious mind can pick it up o Subliminal Seduction  Claim that people will try to influence you without your knowledge  Claim that this is very dangerous and if you come into contact with these ads and it goes against your belief of stuff, for some people it causes psychological issues like headaches and in a sense it's challenging their moral code (physical discomfort)  Very difficult to study because you need to know and understand the sensitivity of the system o Signal Detection Theory  When you present stimuli but you manipulate the background to blend in  Correct Rejection - Saying no when something isn't there  Hit - Saying yes when something is there  Miss - Saying no when something was there  False Alarm - Saying yes when something isn't there  In experiments, mostly worried about Hit and False Alarm because this is all you need to know  If we know the person has a h
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