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Module 17.docx

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University of Guelph
PSYC 1000
Dan Meegan

Module 17: Basic Principles of Sensation and Perception - Sensation o The process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment - Perception o The process of organizing and interpreting sensory information o Enabling us to recognize meaningful objects and events - Bottom up processing o Analysis that begins with the sensory receptors and works up to the brain’s integration of sensory information - Top down processing o Information processing guided by higher level mental processes o As when we construct perceptions drawing on out experience and expectations Transduction - Our senses o Receive sensory stimulation  Often using specialized receptor cells o Transform that stimulation into neural impulses o Deliver the neural information to our brain - Transduction o Conversion of one form of energy into another o In sensation the transforming of stimulus energies such as sights, sounds, and smells into neural impulses our brain can interpret - Psychophysics o The study of relationships between the physical characteristics of stimuli and our psychological experience of them  Such as their intensity Thresholds - Xrays, radiowaves, ultraviolet and infared light, soundwaves are struck in high and low frequencies Absolute Thresholds - The minimum stimulation needed to detect a particular stimulus 50% of the time - Detecting a weak stimulus depends on its strength and your psychological state - Signal detection theory o Predicting how and when we detect the presence of a faint stimulus amid background stimulation o Assumes there is no single absolute threshold and that detection depends partly on person’s experience, expectations, motivation and alertness o Understand why people react differently to the same stimuli and why a persons reaction changes in circumstances - Subliminal o Below one’s absolute threshold for conscious awareness  Can reach your visua
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