Which of the following statements about the two formulations of the firing rate model is not correct? Formulation 1: r=F(I), τdI/dt=-I+w·u. Formulation 2: τdr/dt=-r+F(w·u). *58. (Part 18, difficult) 105-Final
A. The two formulations are equivalent and can be applied to any condition.
B. The formulation 1 is used when the time scale of the synaptic dynamics is much slower than the membrane dynamics.
C. The formulation 2 is used when the synaptic dynamics is much faster than the membrane dynamics.
D. The formulation 1 describes the dynamics of the synaptic current while the formulation 2 does not.
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Which of the following statements about eigenvectors of a matrix is always correct? 55. (Part 17, medium)105-Final
After transforming by its associated matrix, an eigenvector does not change its length.
B. Eigenvectors of a matrix are perpendicular to each other.
C. An nxm matrix has n+m eigenvectors.
D. An eigenvector does not change its direction after being transformed by its associated matrix.
In the two-exponential function used to describe the synaptic gating variable, the rise time is determined by 18. (Part 07, easy)105-Mid
A. only one of the time constants.
B. the duration of neurotransmitter release.
C. both time constants.
D. none of above.
Which of the following processes does not involved in the signal propagation at a chemical synapse? 16. (Part 06, medium) 105-Mid
A. synaptic vesicles release neurotransmitters in the presynaptic terminal.
B. neurotransmitters diffuse across the synaptic clef.
C. Postsynaptic receptors are activated by the neurotransmitters.
D. Vesicles transport neurotransmitters from the synaptic terminals to the soma in the postsynaptic side.
What happens to a leaky integrate-and-fire neurons when the refractory period is introduced to the model? 14. (Part 05, difficult) 105-Mid
A. The firing rate is increased under the same current input.
B. The neuron starts to fire spontaneously.
C. The firing rate of the neuron is limited by a maximum level.
D. The maximum firing rate of the neuron is increased.
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