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1stprelim2010ans - -1 Answers to the first prelim in Psych...

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-1- Answers to the first prelim in Psych 2050 taken 4 Oct 10 1a. Phantom limb pain can arise centrally (in the brain) as well as in the periphery, Tenet 7 (Day 7, text p. 344) 1b. Phantom limbs assure us that the brain has a representation of each limb even after than limb has been removed (Day 7). 1c&d. (Day 2) Dualism: the mind and body (brain) are made of separate stuff Behaviorism: the mind is epiphenomenal and doesn’t really exist. Central State Identity theory: mental events in the mind are identical to physical events in the brain. Functionalism: mental events are functionally related to physical events in the brain In general you received ½ pt if you described the position but didn’t name it. 2a. entity: sine waves 2b. dimensions: frequency, amplitude, and phase (Day 9, pp. 261-264). 2c: any one of these if you drew them correctly but didn’t name the dimension you got partial credit. 3a: 3b: the dimple (between about 1000 & 5000 Hz) is due to the amplification by the ear canal (external auditory meatus). Some credit was lost if the drawing was inaccurate or there were mislabelings
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-2- 4a-4g. Two sets of numbers were possible, as shown below: (Day 4 and text appendix) 4h: d’ = z[CR/(CR+FA)] – z[M/(H+M)] 4i. ROC curves plot sensitivity (d’) as a function of percent hits and percent false alarms and allow better understanding of tradeoffs of performance and bias. (p. 419) 4j. adaptation is a change in d’ (Day 6) 5a. Neuropathic pain is pain caused by lesions or damage to the (central) nervous system (p. 343) 5b. Haptics is the perception of 3D objects by touch and is a combination of cutaneous sensitivity and kinesthesis (Day 8; pp. 340-341) 5c. Most receptive fields have a center surround organization with an inhibitory surround and an excitatory center. You should have drawn two concentric circles (DAY 7, pp. 337, 342) Half credit for detailed diagrams of receptor types, although this wasn’t what the question was about. 6a. Timbre is the quality of sound that is not pitch or loudness, as in two musical instruments playing the same note. (Day 9, pp. 267-268) Full credit for “complexity of a sound.” 6b. Intensity differences are coded in most sensory systems by having more neural spikes per unit time (inference from Days 4 & 11). 6c. Equal loudness functions (e.g. from the Fletcher-Munson curves; see Question 3) connect tones of different frequencies and amplitudes that have the same apparent loudness. (Day 9, p. 266) 6d. Statistical learning is learning (done by infants for the purpose of language learning) about transitional probabilities and other characteristics of the environment.
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