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Hockenbury Discovering Psychology 5th txtbk

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CONCEPTMAPSENSATION AND PERCEPTIONSensationStimulation of sensory receptors by some form of energyTo be detected, must exceed sensory threshold.Sensory thresholds include:• Absolute threshold• Difference threshold (just noticeable difference)as defined by Weber's law• Sensory adaptationTransduction: Energy is converted intoneural signals and transmitted tothe brainPerception: Signals are interpretedin the brainVisionColor vision: Psychological experienceof different wavelengthsHue: Light wavelengthSaturation: Purity of light wavelengthBrightness: Amplitude of light waveRods:• Dim light• Peripheral vision• Black/white visionCones:• Bright light• Concentrated in fovea• Fine details (visual acuity)• Color visionTrichromatic theory: Explains color processingin conesOpponent-process theory: Explains colorprocessing in ganglion cells and brainSend information to:• Bipolar cells• Ganglion cells• Optic nerve• Thalamus• Visual cortexHearingSound wave amplitude determines loudnessSound wave frequency determines pitchSound wave complexity determines timbrePitch perception explained by• Frequency theory• Place theory

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