NPB+112+11+sample+midterm+2 - NPB 112 practice exam...

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NPB 112: practice exam questions, midterm 2 ___ 1. Which of the following would NOT occur while walking on a tightrope: (a) descending systems override flexion withdrawal reflexes evoked when the rope digs painfully into the foot (b) the gamma motoneuron system resets muscle spindle sensitivity so that they continue to signal changes in the length of contracting muscles (c) the spinocerebellum actively compares corticospinal commands to leg motoneurons with feedback from muscle, joint and skin receptors in the legs (d) contracting muscles are relaxed by the inverse myotatic reflex, but as they start to stretch they abruptly contract again due to the stretch reflex ___ 2. In the cerebellum (a) Purkinje cells of the cerebellar cortex release GABA to inhibit deep nuclear output cells (b) granule cells give rise to parallel fibers which run at right angles to the dendrites of Purkinje cells (c) pathways coming into the cerebellum cause an initial inhibition of deep nuclear output cells, followed later by excitation due to processing in the cerebellar cortex (d) a and b are correct (e) all of the above are correct __ 3. Cells in the parvocellular subdivisions of the lateral geniculate nucleus are: (a) orientation selective (b) unselective for the wavelength of light (c) characterized by spatially overlapping ON an OFF sub-fields (d) characterized by color-opponent center-surround antagonism (e) responsive to input from both eyes __ 4. The receptive fields of simple cells in primary visual cortex: (a) exhibit center-surround antagonism (b) have spatially overlapping ON and OFF sub-fields (c) have spatially non-overlapping ON and OFF sub-fields (d) receive input directly from retinal ganglion cells (e) have a high magnification factor __ 5. Primary visual cortex: (a) is NOT the first site of convergence of input from the two eyes (b) is organized into 4 principal layers (c) contains cells that are selective for the orientation of lines and edges (d) is non-retinotopically organized (e) all of the above are correct
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__ 6. Which of the following is NOT used to distinguish different visual areas in extrastriate cortex: (a) anatomical connections with other cortical areas (b) different receptive field properties or neuronal selectivities (c) different consequences (deficits) resulting from damage to different regions (d) separate maps of visual space in each area __7. There are two major "streams" of information flow in visual cortex that are sometimes referred to as: (a) "sight" and "sound" pathways (b) "red" and "green" pathways (c) "what" and "where" pathways (d) "recognition" and"memory" pathways __ 8. Mechanisms by which increased firing of action potentials in motor cortex neurons leads to increased force of muscle contraction include: (a) increase in the rate of action potentials sent by individual alpha-motoneurons to the muscle (rate coding) (b) increase in the number of alpha-motoneurons sending action potentials to the muscle (recruitment) (c) decrease in the rate of action potentials sent by
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NPB+112+11+sample+midterm+2 - NPB 112 practice exam...

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