Chat with AIExam 4: A: Sensation and Perception
Distinguish between sensation and perception and explain the nature of transduction (with visual and auditory examples).
(81) 
VerifiedAnswers will vary but should include the general points mentioned below for full credit.
--Sensation refers to the detection of physical energy by the senses;perception represents the brain's interpretation of those sensory inputs.
--Transduction involves the translation of sensory input into a neural code that the brain can understand.For example,if you see a red ball,the sensory receptors in the eye send a message to the brain indicating the presence of that particular wavelength of light.Alternatively,if you hear the high frequency from a soprano solo,the sensory receptors send a message along the auditory nerve to the brain where it is perceived as a high sound.
Explain how the gate control model of pain perception relates to people's ability to withstand excruciating pain and how distraction and placebos relate to the gate control model.
(78) VerifiedAnswers will vary but should contain the following points with supporting discussion to earn full credit.
-- Pain is physiological and emotional in nature,involving structures in the limbic system as well as basic somatosensory activity.
-- The gate control model (Melzack & Wall)proposes that intense pain can be blocked in circumstances (i.e. ,birthing,skin grafts,combat injuries)from consciousness because neural mechanisms in the spinal cord function as a "gate" to control the flow of sensory input to the CNS.
-- Using things like distraction and placebos are a way of dividing attention away from pain and permitting less focus on the pain itself (like a gate).
Discuss the evidence for vision being the most important of our senses.
(77) VerifiedAnswers will vary but should contain at least three of the following points with supporting discussion to earn full credit.
--Light is fundamental to our biology and culture.Without vision,we couldn't sense or perceive much of anything about light other than the heat produced.
--We would miss most of the experiences that occur around us;think of all of the times that we've told someone "watch me/this," "look over here," "are you watching,Mommy/Daddy?"
--The Gestalt principles and the majority of the illusions mentioned in the text are applicable to vision (and in some instances hearing).
--Dizziness and nausea result when our vestibular and visual inputs are not synchronized.
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