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Module 17.docx

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PSYC 1000
Dan Meegan

Module 17 Basic Principles of Sensations and Perception  Sensation is the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment  Perception is the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events  Bottom-up processing is analysis that beings at the sensory receptors and moves its way up to higher levels of processing  Top-down processing constructs perceptions from the sensory input by drawing on our experience and expectations o Bottom up shows what we see and top down interprets it Transduction  Our senses o Receive sensory stimulation, often using specialized receptor cells o Transforms that stimulation into neural impulse o Deliver the neural information to our brain  Transduction is the process of converting one form of energy into another that our brain can use  Psychophysics is the study of relationships between the physical characteristics of stimuli, such as their intensity, and our psychological experience of them Thresholds  We as humans don’t see many types of waves o But there is a small opening that is enough Absolute Thresholds  Absolute threshold is the minimum stimulation needed to detect a particular stimulus 50 % of the time o Detect light, sound, pressure, taste, or odor  Signal detection theory predicts when we will detect a weak stimulation with noise around o Believes there is no absolute threshold just reactions vary as circumstances change
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