exam review 2

exam review 2 - 1. Define sensation and perception. a....

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1. Define sensation and perception. a. Sensation – receptors for sensory systems register energy from the external environment: sound, light, odors, ect. b. Perception – occurs when the info from sensation is processed within the CNS. It is, literally, what you perceive – in essence, the content of your conscious experience. 2. Provide specific examples that prove that perception is not perfect copy of the physical world. a. Sensation without perception b. Perception without sensation c. Optical illusions 3. Is it possible to have sensation without perception-provide evidence. Is it possible to have perception without sensation-provide evidence. a. Yes, subliminal advertising; the people are seeing the slide but are not conscious of it b. You can perceive a face out of a bunch of vegetables or imagine a white triangle on top of a black triangle outline or perceive that lines getting lighter to the side in that bar picture 4. Be sure you can identify the 6 senses, their receptors, the process by which the receptors turn physical stimuli into graded or action potentials, the path to the cortex (indicating where synapses occur) and some indication of how coding occurs for some aspect of the stimuli. Know vision, olfaction, and somatosensation in more detail than the others. a. Vision i. Receptors – light receptors in the retina b. Audition c. Olfaction d. Somatosensation e. Kinesthesis f. Gustation 5. Know the general properties of sensory systems and be able to give at least 2
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examples (from at least 2 sensory systems) for each general principle. • Law of specific nerve energies also called labeled lines • Sensory systems respond best to change and stop responding (adaptation or habituation) when stimulus is unchanging. • Some coding is done at lower (prior to cortex) levels of processing • Representations of the sensory world are mapped in an organized fashion (topographically) in the pathway and in the cortex (somatotopic, retinotopic, etc.) • Reorganization of cortex after loss of input. Adjacent neurons sprout and make new synapses after damage. • Parallel paths within a sensory system • Neural “tuning” of perception/pathway during development 6. What is synesthesia and what common property does it violate? How might it occur? 7. Why might odors evoke such vivid autobiographical memories? 8.
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This note was uploaded on 05/31/2009 for the course PSYCH 91 taught by Professor Williams during the Spring '07 term at Duke.

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exam review 2 - 1. Define sensation and perception. a....

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