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Sensation

Sensation. What is Sensation?. Occurs anytime a stimulus (alarm clock, light) activates one of our receptors The ears detect changes in sound, eyes-light, skin-heat etc. When sensations combine with past experiences they are called perceptions Perception

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Sensation

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  1. Sensation

  2. What is Sensation? • Occurs anytime a stimulus (alarm clock, light) activates one of our receptors • The ears detect changes in sound, eyes-light, skin-heat etc. • When sensations combine with past experiences they are called perceptions • Perception • Organization of sensory information into meaningful experiences

  3. Psychophysics • The study of the relationships between sensory experiences and the physical stimuli that cause them.

  4. Threshold • Absolute Threshold • The weakest amount of stimulus required to produce a sensation. • The absolute threshold is the level of threshold that is detected 50% of the time. • Difference Threshold • The minimum amount of difference a person can detect between 2 stimuli 50% of the time. • Just Noticeable Difference • Smallest increase/decrease in a stimulus a person can detect

  5. Weber’s Law • The longer or stronger a stimulus, the larger the change required for a person to notice anything occurred. • Some people are more sensitive to change than others • These people may work as food tasters

  6. Sensory Adaptation • Our senses enable us to respond to changes in our environment. • They have the ability to adapt • Eyes adapting to a dark room

  7. Signal Detection Theory • Studies the relations between motivation, sensitivity, and decision making in detecting the presence, or absence of a stimulus. • Radar operator or student completing a reading assignment

  8. Processing Stimuli • Preattentive Process is a method for extracting information automatically and simultaneously when presented with stimuli. • Attentive Process is a procedure that considers only 1 part of the stimuli presented at a time • Stroop Effect • We notice some things automatically despite distractions but others require more careful attention

  9. Closing Question • What would happen if you asked a 4 year old child who knew his colors but could not read to complete the activity? • What if you tried this experiment with someone who did not speak English? • What if you used non-color words?

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