Class Notes (838,393)
Canada (510,877)
Psychology (3,528)
PSY493H1 (9)

PSY493 OCT 23.docx

13 Pages
Unlock Document

Adam Keith Anderson

PSY493 OCT 23, 2012 Brain function: perception and encoding Per - Eye to the brain - Eye how the orgins of organization of perceptual system takes place in retina - And program used for brain organization - Perception 2 perspectives – is perception analysis of little bits of the world and building up - Or perception start with the hole and fills In picture - Both things are happening Visual maps - Building things from pieces - Chuck close - Later in life paraplegic couldn’t use arms to paint and make self portraits of hims - Contruced world in tiny representations - Creating the whole by making bits and pirces not look like chuck - Analyzing from parts not get to the whole - How to get to the whole - Think of these as receptive fields and come together to form lager object in the brain - Nrueons respond to orientations and come together and build the face - Look across the portraits - All portraits all different but of the same thing - Brian creating picture for you that thinks is out there - Perceive the world see one thing, all cohere together to be one painting - Brain perceptual illusion, differeat portraits in different parts of the brain - 50 different paintings in brain of same thing - Different parts depicting different portraits fo reality at same time - Cant attend to diffent things, decontrosut things into maps - Multiple maps Vusion as analytic - Analystic - We build up perception through components - Nueban figures – two interprations low is h or l - Global level the l is made of this h and h of l - Little details and global scale - Gestakt - Low spatial frequency is blurry – big changes in environem - High spaturial freuqncy is clear - Low is highlighting - Things computed same time in brain Convergence - Analysis in neural terms - Start off some data in world and analyzing into parts and breaking it up to more and more things - Dots of light more is extracted - Original file and and adjustment and sace differentfiles like contrast is abstraction of original photo more files - Brain takes original and makes more files to extract more data - Extracting more and more information - Nueral divergence idea more and more - Retina top cells respond to simple things - And higher up more complex things - No cells in retina respond to faces higher places more infor - Other part theoryitical - Humoty dumpty - If whole world is on retina and brain breaks apart - How does brain put back together - This is neural convergence - All come back to to converge to a cell that is of grandma - Do all things have to come together to say his is grandma, does cell look at all of these things color etc - One solution is neural convergence , divergence then glued back togtther one is attention and idea of constellations in the brain Overieveiew - Some parallel processing - Two thingshappening simulrnatously - Not in serial do one thing then hand it off then do it - In retina extract multiolke things at same time - Analytic more to the rods – centreal vision hd in color think of oncious vision is cones - Periphery more blurry and not much conscious access to it is rods - Cones one pathway in brain – parvocellualr pathway – high resolution colour - Rods magnocellurlar - Distinction starts in retina Eye to cns - Rgs – the visual system peope think about - Streucture alon pathway - Lgn in thalkmus - To striatre cortex in brain - Offshoot from retina bypasses lgn goes to colliculus superor and inferior and to pulvinar nuclus in thalamus - Original visual system - Older visual systems – original system before fancy cortex - To striate is newer - Thispathway the odler is for eye movements - Process things without awareness – frog vision – for orientating without knowing what they are for Rgs - What ssyetm – whats out there - Disorder in system lesions to straite cortex or to lgn - Result brain blindness – retina is find sending information to brain nothing there - Most periphera blindness - Some stroke do damage – will be blind retna repsionding to light to brain - Dmage one half have hemniopia lost visoon in half visual field Blindisht - Eyes still tract things In blind visual field - Controversial idea - Damage to rgs imariment in conscious vision go to neurologist and say blind and check vision - Do experiment move eyes to dot of light in blind viusla field - Cruel experiment - Patient fixates and presented to blind visual filed and presented with tone and move eyes to location – and move eyes they think randomly - When blank trails no presentation lying – play tone move eyes no difernce equally likle - Trials light presented essentricity tracts the location - Dotted line no light random nothing systematic - Lught in visual filed further light presented move eyes move - Two interpretations - 1, due to other visual pathway – not support seeing but eye movement - Not consciousness determines where eye moves see things that why moves eye to look at tehm - Eyes pre[aring u to see - 2, this pathway doesn’t exist vestigial not do anything, what Is haopenign people aren’t complelty blind - Not complelty unconscious - Some bit light getting through - Its incomplete functionally blind but tested some processing left - Old patway brken to some degree Rcp - Pathway related to eye movements - Action not seeing - Study - Where not what - Presented to visual field - Dark blind light is sighterd - And ask move eyes to target in sighted visual field - They present another stimulus in blind as well as in working - Not measuring seeing something but movement - Tow motor programs - Single target people are very fast - When another target is presented slowed to go to visual field - Slowling is competing motor programs - Older is look both things and make choice, conciouness wins - Competing motoro programs - Were to move head not consciousness Suprachia - Another patway not about where things are or what - But light to tell you what time of day it is - When to be active - What reg behavior is may think consciousness - Influence sleeping patterns by light and dark - Orgaizne around something that has always been there - Not need sight - Distinctinct photoresector not about seeing but synchronizing the clock another visual pathway - Humans blind no rods or cones but still have activity synch with light not see but light in room wake up - No other cues blind use light information, unconciusperception - Phot rece to suprachaiamt of brainstem - Older visual patways older purposes not about consciousness but important functions still opertain g in brain - Conclusion many types of vison only one aware of Rgn - Contralteral org of visual system - Right to left - And left to right - Turns out - Right filed present to left part of retina - Hemiretians presented goes to that hemipshere - And right to left hemipsheretina - Part of optics in eye - Damage in left hemisper then deficits in right - Lgn primary visual nucleus - Own laminal strucuteu – laminal 6 sandwich Next - More closer see ips and contr - Oraginazing principle pf eye - Layers alt cont or ips - Switiching eye infor is coming from - If visual field and bird in visual field and lgn repr it - 6 represernations of it - Multiple paintings of same thing - What does left and right eye see of same thing - Right and left eye need to be compared - Compare left and right then above below each other - Important depth perception - If comparing left and right then two layers - Why more pics - 3 sets of left right eye - Pic rep different things Rgp - Cytoarcherticure - First 3 layers are thick bottom thin - Tick layers parvo - Thing marvo - Magnor left and right eye - Parvo means small and magno big - Reason is bc cells are biger not layers - Rods and cones see kept seperae Oranaztion - Next sysnapse from subcortical thalamsus to first synoaes in v1 divsision remain in there - Retina to lgn there are v1 m and p kept disitnc - Then two parallael on p one m - Parvo – object reco - And mago is where things are and interact for action - Mt and mst – motion - What and where - What and where how – related to action - Portraits characterized to different information - Further up see divergence – retina to more brain areas explosion of different brain areas getting info – calculating more and more complex things - Parallel – things in paralle - And conveyor belt – things built up more complex - As move higher and higher in visual system - Receptive fields of photeceptor is small and look at cells respond to faces – is particular location of world answer is no – these cells receptive field entire visual field - Parts of brain see face no matter where in visual field - Mystery how happens - Increase receptive field size in higher layers Pvs - Striate cortex bc striated - Stain it is striated - Brodmans area number 17 - This all same thing then changes - This looks diffent call it 17 and looks different name it 18 - Looks different – physically looks different - First cortical synapse in visiual ssytem - Culanie sulcue - Retinopy - Picture movie in brain - Could be patterns of neurons firing - But topographic organ - Picture of thing in back of brain and develop this picture - Monkey brain - More posterior repre central visual filed more anterior more periphery - Eccentric - If monkeys eyes anetizse muscles in eye and fixate in bullseye - And injected with voltage sensitive die in back of brain more active take in more die - Monley sacrifice to get to develop the film that is there brain - Spread out visual cortex into flat map - See picture of bullseye in monleyes brain - Brain cnverts something into neural impulses but topohaic – pictures in the brain - Not org in random way - Part of code is making picture - When mentally imagine – your internally casting pictures in visual cortex Ma nd p - M and p layers wahy remain distinct in visual system difernt layers in lgn project to different layers in primary cortex, all same cortex but kept separate - Remain segrated – all surface go to v1 but not all converging - Segration – different roads to what and where pathways in brain Straite cortex - Classic center surround
More Less

Related notes for PSY493H1

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.