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Lecture 7

lecture 7 notes on attention

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PSYB51-lecture 7 What is the univariance problem in colour perception? How does our colour solve the problem?What is the horopter? Univariance problem is where you might have a photoreceptor that might itself contribute to colour perception but alone is not colour sensitive because signal is ambiguous. SO whatever light enters and stimulates photoreceptor, we dont know what wavelength it is because any combination of wavelength and light energy can produce any kind of output of this. The solution is that you have more than one colour sensitive photoreceptor (ie red,green and blue cones in retina, the combination of the output of these 3 cones tells us what colour we are looking at) What is the heropter? We get visions from 2 sources (eyes) so we have two versions (we have double vision) But you can avoid it when you fixate your eyes on some object where the eyes convergediverge on that object; that means the fovea of the two eyes there is no double image (there is one point of heropter, but there are many other points where its like this, there are many other points in space where you dont have double vision, creating a circle) Horopter-area where we dont have double vision Selective attention is a cognitive brain mechanism that enables one to process(facilitating mechanism) relevant inputs, thoughts, or actions while ignoring(suppressing) others that are less important, irrelevant or distracting - Arousal: several processes in brain are inhibited during sleep to ignore it, it has to do with arousal - Arousal and attention can interact, when you have very little arousal your attention is low, as arousal increases attention increases as well, however if arousal increases to a very high point, attention might be comprised - Too much arousal can be detrimental to attention because you can have motor deficiencies, problems concentrating, arousal activates all sorts of sensitive input and too many to suppress Why we need attention? - Bottlenecks: it is impossible to process everything at once. Lace of brain, lack of arms(just way too many information to process at the same time, cant process all the details, too much going on); will need a big brain which is a disadvantage, it will take up way too much energy - Bottleneck exists at sensory, cognitive(thoughts etc) - motor bottleneck involving muscle activity-we only have two arms etc. - when something is relevant to us, we can focus on one thing and ignore other things; ultimately we need to survive(so maybe we might miss important details) - in order to solve this problem we have various heuristics which dont work
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