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PSYC2390 - Lecture Feb 12.docx

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PSYC 2390
Lana Trick

PSYC*2390 Lecture Feb 12 Vision and the Brain Parietal cortex Hemi-spatial neglect  Associated with right-parietal damage  Makes it difficult for a person to notice things on the left side of the field of vision, not the eye  They aren’t aware that they aren’t noticing it  Diagnose it by a cancellation test o Have a sheet with a bunch of letters o Tell them to cancel out all the b’s o They will only cancel out those in the right side of the vision o Can also be noticed when they are eating, they will only eat right side of the plate, if you turn it around they will be aware of the remainder of the food o If you ask them to point straight ahead, they will point to the right side a little bit more so than straight  There is evidence that people with hemi-spatial neglect can sometimes get information on the left side o Ramachandran experiment o Showed patients with it two pictures – both of the same house but one has a fire coming out of it – pictures are on top of each other, look at a black dot in the centre (in between the houses), you want to make sure they aren’t moving their eyes around o Asked them if the houses are the same – yes – are they exactly the same – yes o Now ask them which one they would prefer to live in and they subconsciously choose the one without the fire Colour Vision (Chapter 9) What is colour?  We are sensitive to two parts of vision o Brightness which is the amplitude (bigger = brighter) o Colour is the wavelength  We can perceive ~350-750 nm  Most of the colour we perceive is reflected light Achromatic: black, white, grey – no colour  White reflects lots of light, all the wavelengths, black doesn’t reflect much at all, grey reflects equally across all wavelengths but middle amount Chromatic: blue, green, yellow, orange, red, etc.  We can see the colour of something because an object absorbed everything else but that colour o Ex. Red shirt – the object absorbed every colour but red and the red was reflected Aspects of colour experience Hue: most closely related to wavelengths  Red wavelength has lots of long wavelengths Brightness: how much light you are getting Saturation: purity of the colour  Monochromatic is pure light, 540 nm only  Desaturated colours, a mixture of colours – not pure Young and Helmholtz  Figured out that there must be three different colour receptors – the cones Colour Matching Experiment  This is how they realized we have to have three colour receptors  Projector with each having a dimmer switch, projector projects blue, green, red light  Put all the projectors to a point where they are all on the same spot  Saw that if you mix all of the three colours, you can get a monochromatic colour  Metamer – two things physically different that look the same o You can create a metamer by mixing all three of the colours – same colour but different wavelengths  The reason you can create any colour by the mixture of different wavelengths is because we have three colour receptors  Pointillism painting – tiny dots of colour put beside each other so that the colours “mix” to look like another colour o When you look closely it looks different o When you step back far, you see colours that cant be mixed on a palette  Light rays f
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