Flashcards in chapter 4 Deck (107)
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sensation
stimulation of sense organs
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perception
interpretation of sensory input
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psychophysics
how physical stimuli are translated into psychological experience (used to measure threshold)
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gustav fechner
discovered the concept of threshold
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absolute threshold
minimal amount of stimulus that can be detected 50% of the time
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threshold
at what point do we detect stimulus
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JND
smallest difference detectable between 2 stimuli
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Websters Law
Size of JND is proportional to size of original stimulus ex: 30-31, 60-62 etc
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signal detection theory
detection of sensory information is influenced by sensory processes and decision processes-- hit, false alarm, miss, correct rejection
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"hit"
stimulus present and subjects response is present
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miss
stimulus present but subject response is absent
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absent
stimulus is absent but subject believes it is present
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correct rejection
stimulus is absent and subject believes it is absent
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Perception without awareness
advertising** used to influence buyers without buyers noticing
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subliminal perception
stimulus presented just beyond our threshold
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sensory adaptation
stimulus is present and doesn't change but our reaction has changed-- decline in sensitivity, overtime we become less sensitive to the stimulus
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synaesthesia
condition in which perceptual/cognitive activities trigger special experiences--senses overlap (ex see colour over math)
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Graphemes
numbers and letters have colour
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light
electromagnetic radiation
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brightness of light
amplitude (height of light wave)
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colour of light
wavelength, distance from one peak to the next, long-red, short-blue
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purity
mixture of wavelength in the light
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saturation
richness of colour, amount of whiteness in a colour impact saturation
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pure vs not pure (aka saturation)
pure- one wave
not pure- a bunch of wavelength
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retina
neural tissue at the back of our eye
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cornea
where light waves begin to penetrate our eyes, transparent
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anterior chamber,
filled with a fluid called aqueous humor, flows through canals, constantly being replaced, blockage in the canal leads to build up of pressure in the eye--> glaucoma, leads to blindness
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lens
lens refract the light waves when it enters the eye, bending the light waves causes it to be flipped and backwards
little muscles relax: lens fattens, near
little muscles flex: lens becomes thin, far
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vitreous humor
jelly like substance in the posterior chamber, developed as a fetus, leftover proteins are squiglys
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