Chapter 6 Psy - Sensation vs perception 3 basic elements...

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Sensation vs perception 3 basic elements Stimulus- physical characteristic (what it is), and its psychological attributes (how we react to it) Receptor- receives the stimulus and sets the reaction in motion Organism-shaped by prior experiences and current physiological state **The stimulus, receptor and organism combine to determine the ways in which we respond A sensation occurs any time a stimulus activates one of your receptors. It can be called a sensation throughout the processes involved in receiving the stimulus and communication it into the brain. Perception occurs when you apply your experience to interpret sensations. It is composed of sensations to which the brain reacts. **there is no clear line of separation bw the two processes. It is best to visualize sensation and perception as occupying opposite ends of a continuum with a gray or fuzzy border separating the two processes. Human Senses- Different kinds of recpetors, we have ten senses. Vision, hearing, smell, taste, skin senses(pressure, hot, cold and pain) as well as balance, body sense or kinesthesis. . Stimuli has 6 senses, based on sensitivity to light, sound, gas, liquids, solids and body position and motion. Psychophysics and Thresholds Psychophysics-branch of psychology that studies the relations bw physical events and related psychological experiences. We examine each of our senses in terms of the physical stimulus(light or gas)and the psychological experience(vision or smell) Absolute threshold-smallest amount of a stimulus that can be detected by and organism. This amount is not constant bw or wi organisms. Just-noticeable-difference(jnd)-the amount by which any stimulus must be changed in order for that change to be detected. Difference threshold-the amount of change necessary in order for the change to be detected half of the time. Webers law-the greater absolute method of any stimulus, the larger the amount of relative change that will be required in that stimulus b4 an observer can detect it. Delta S/S=K
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Delta=change, S=stimulus magnitude and K=constant Vision Physical stimulus for vision is light which stimulated the eye. Light from any source has three physical characteristics; Wavelength-seen by us hue Intensity(amplitude)-seen as brightness Pureness-seen as saturation Any change in one of physical characteristics makes a difference in our experience of light and alters the operation of our eye. The sun emits white light, and is a mixture of all light wavelengths. HUE identifies the perceived color of a particular wave. Wavelength changes hue changes. Brightness related to amount of light present, as intensity, amplitude amount or magnitude of a light wave increases. Photometer is light meter measures the intensity of physical light waves entering the lens. Saturation sometimes called purity
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Chapter 6 Psy - Sensation vs perception 3 basic elements...

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