Psych - 3rd - November 13th 2015 Stimuli Sensations and...

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November 13 th , 2015 Stimuli, Sensations, and Perceptions Stimulus Discrimination o Just noticeable difference (JND) (Minimum difference accurately perceived) o Weber’s Law (JND in sensation is always a constant proportion of the initial intensity o Fechner’s Law Stimulus Detection o Sensory threshold o Criterion o Signal detection theory o Hit, miss, correct rejection, false alarm Vision Physical measurement of light waves o Photons o Wavelength o Frequency o Amplitude Light is only a very small portion of the electromagnetic spectrum The structure of an eye o Cornea o Iris o Lens o Aqueous humour o Pupil November 16, 2015 – Monday Nobel prize winners Receptive Fields Microelectrodes can be used to record the firing activity of a single cortical visual neuron o Cortial neurons have a background rate of firing (impulses/sec) o This rate of firing can increase or decrease in response to a stimulus Receptive field refers to that part of the visual field that the neuron responds to o The general pattern of the receptive field can be recorded at each level of a sensory system.
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Visual processing in the cortex Hypercomplex cells respond to additional features such as line length or particular types of curvature In some other regions of the brain there are cells that are tuned for very complex stimuli, such as faces There are three main types of cells tuned to analyze different aspecs of the visual information o Simple cells: respond to lines in a particular place and at a particular orientation o Complex cells: similar to simple cells except the line must be moving (with preferred speeds and directions) o Hypercomplex cells: respond to additional features such as line length or particular types of curvature In other regions of the brain there are cells that are sensitive to much other complex features Vision The role of receptor cells Theories of colour vision o Trichromatic (“three-colour”) theory Trichromatic theory of colour vision
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