Class Notes (836,136)
Canada (509,645)
Psychology (7,782)
PSYB51H3 (314)


5 Pages
Unlock Document

Matthias Niemeier

Psyb51-Perception and cognition -All exams have short answers What can be learned from early philosophy about perception -pyschophysics: major important things in psych, a lot is derived from here, comes from philosophy Early philosophy of perception -plato: wrote allegory of the cave, pictures us as how we perceive the world -he claims we are like prisoners born in a cave facing the back wall of the cave -we don’t know anything that is outside the cave because we are chained to the wall, we are a prisoner of our perception -our conception of reality is a product of what is gathered through the senses -sense came into existence to serve purposes ex: survival ex: venus fly trap, primitive motor system, plant needs sensation to survive, the vibration by the fly the plant senses it, color is however irrelevant -bees see ultraviolet, snakes have heat senses, dogs have hearing abilities and birds have certain types acute vision and motion detection -we can sometimes develop sense that we normally don’t have ex: ben underwood, was blind had good hearing, and learned echolocation like dolphins, by the sounds you can tell whats out there, by how the sounds bounced off of things. -plato: our reality is restricted to things that we perceive -depends on our sensory channels, what kind of senses we have and also depends on ourselves -heraclitus: greek philosopher, you can never step into same river twice, it’s the same river -the perceiver can not perceive the same event the same way the next time around -our perception system is designed to pick out changes we are tuned to that -adaptation is a key element of being able to perceive something in the same place -look clearly at a male face you get adapted to the mal face, you perceive malee faces more and vice versa -your perception for neutral face is biased -what you biased your perception to is what you are more likely to perceive -democritus: laughing philosopher -came up with the concept of atoms, that which can no longer be split is an atom -had some ideas of perception, he was confident of what we see is what we get -his sensation theory of molecules peeling off and traveling through the air is false but true for olfaction and taste -**senssory transduction: perception is the result of the physical interaction between the world and our bodies -sensation: is low level mechanistic action of how energy is transduced into neural signals -perception: high level aspect is cognitive aspect, what we make out of sensation Nativism and empiricism -nativism: things we know we don’t know from experience we are just born with those things -plato: reality comes from people’s minds and souls -we have something we’re born with -descartes: dualist view mind is born with the ideas (nativism goes with dualism). Mind and body are separate entities -prob with dualist view-If there is a soul or mind independent of matter, how do they interact? if mind has no physical properties how does it interact with the body -so ppl assumed mind and body are separate entities but worked together -simplest explanation: monism: idea that the mind and body are reduced to a single principle of being -sollypsism: its just I that exists -everything is matter (materialism): the mind is somehow associated with functions of the brain -materialism:there is no soul, but how can u be born and know things unless you experience them -so the empiricist: experience is the only soul of knowledge -hobbes: everything that can be known has to be learned through the senses -locke: come tableraza we are born clean slate, and as we experience things we learn them -nativism: born with knowledge empiricism: we gain knowledge -nowadays: combination of both -empiricism: we learn from our senses, but that’s not all -nativist: we are born with things, which is passed on through our genes The dawn of psychophysics -fechner: developed idea of panphsychism: all matter has consciousness -his philosophy was the driving force to develop something modern, he was kinda the finder of experimental psych -he invented psychophysics -trying to understand how the mind works, somehow we must make a connection -fechner was inspired by one of his collegues weber -weber: smallest change in stimulus can be dectected as smallest -ex: put a weight in someones hand the change the weight but a lighter, difference in weight . when you put 400g to tell is the next weight is heavier or lighter the other has to be at least 10 gram difference -weber? -weber fraction -this shows a change in perception, this Is how we know there is change -small step to show show perception works, quantify things -JND (just noticeable difference) smallest detected change from the reference stimulus aka difference threshold -2 point threshold: min distance at which 2 stimuli can be distinguished (remember biob30) -if there is different distribution of receptors in hand larger amount of receptors compared to the back -fechners law: relationship between stimulus magnitude -you can actually predict based on physics what people will perceive -absolute threshold: point where you are not sure if you perceive anymore -when you start guessing you may not see but you can guess and be 50% right Psychophysical methods -curve a function plot of yes I saw something -different loudnesses on this curve. Stimulus level in function of percentage of times its prese
More Less

Related notes for PSYB51H3

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.