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Lecture 02

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Matthias Niemeier

Lecture 02 First Step in Vision Example of Short Answer Question: Which kinds of psychophysical methods exist? Mention at least four. Describe one of them in more detail. A: Method of constant stimuli, method of estimation, method of limit, method of adjustment. Method of constant stimuli where you have stimuli such as light with different intensity at fixed value. Randomly present the stimuli to the participant in repetitive manner by keep coming back to same intensity and asked them if they see it or not every time its shown. Through this data, for each level of intensity, could calculate probability of that person to yes, from which derive a curve with low intensity with low probability & high intensity with high probability. The curve is sigmoid function. Vision Retina (back of eye) first stage of vision processing Light Physics Light a electromagnetic wave; a stream of photons, tiny particles that each consist of one quantum of energy o It is little piece out of a vast spectrum of electromagnetic wave starting from long wavelength (TV signal) to visible light from red to blue to very short wavelngtto human visible light is very short spectrum of light o the shorter the wave length, the more powerful the wave is o light doesnt actually have a colour, it is our brain thatassiin physic colours dont exist - colour is created by the visual system 5 ways of light can work: absorbed, diffracted, reflected, transmitted, or refracted: Absorbed: energy (e.g. light) is taken up by some substance and not transmitted at all o E.g. room w dust room (light in) will be reduced in brightness as opposed to when it 1 enter that room o E.g. Light on surface especially blak it will be observed o E.g. Filters also absorbe that picture of filter is red because it only lets out (transmit) light that has wavelength that we perceive as red ligall other wavelength are reduced & probably not completely filtered out
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