Psy 201, Chapter 5 Notes - Chapter 5 Sensation and Perception Introduction Synthesia the misinterpretation of stimuli using a completely different sense

Psy 201, Chapter 5 Notes - Chapter 5 Sensation and...

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Chapter 5: Sensation and PerceptionIntroduction:Synthesia- the “misinterpretation” of stimuli using a completely different sense than the one normally usedoEx 1: Numbers being colors (5 is red, 9 is purple)oEx 2: Driving experience has the taste of pistachio ice cream and earwaxV.S. Ramachandran- “Because the brain area involved in seeing colors is near the brain area involved in understanding numbers, he theorized that in people with color/number synthesia, these two brain areas are somehow connected”oExperiment: Participants with synthesia and patients without synthesia looked at black numbers against white backgroundsoResults: Synthesia participants experienced neural activity in the brain are responsible for color vision whereas the patients without synthesia did not. A number of brain regions work together to convert physical information from the environment (ex.: light and sound waves, chemicals, air temperature, physical pressure, etc.) into meaningful forms (ex.: the smell of a spring day, the feeling of holding hands, the sight of a person we love, etc.)Our experience of the world (what we see, hear, taste, smell, or touch) results from brain processes that actively construct perceptual experiences from sensory informationThis allows us to adapt to the details of our physical environments5.1: How Does Perception Emerge from Sensation?Sensation- the detection of physical stimuli and transmission of that information to the brainoThe basic experience of physical stimuli (ex.: light or sound waves, temperature or pressure changes, etc.)oInvolves no interpretationof what we are experiencingoThe essence of sensation is detectionPerception- the brain’s further processing, organization, and interpretation of sensory informationoResults in our conscious experience of the worldoThe essence of perception is the construction of useful and meaningful information about a particular sensationSensation and perception are integratedinto experience; experience guidessensation and perceptionoBottom-up processing- based on the physical feature of the stimulus; as each sensory aspect of a stimulus is processed, the aspects build up into perception of that stimulusoTop-down processing- how knowledge, expectations, or past experiences shape the interpretation of sensory information (biased view); context affects perception;what we expect to see (higher level) influences what we perceive (lower level)
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