OUTPUT C D B A INPUT Indicate for each neuron A-D whether it...

OUTPUT C D B A INPUT Indicate for each neuron A-D whether it is excitatory or inhibitory (and whether it is Tonically active or NOT Tonically active (1 mark for each correct answer) Inhibitory / Excitatory Tonically Active / Not Tonically active Inhibitory Excitatory TAN NOT TAN Neuron A Neuron B Neuron C Neuron D

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Consider the neural circuit below composed of four neurons labeled A-D and an excitatory neuron labeled 'INPUT'. Neuron 'C' has a branched axon (it has 2 axon terminals) and the terminal labeled 'OUTPUT' acts as an output from the circuit. If the INPUT neuron does not have an action potential (AP), then there will be no output from the circuit ('C' will not have an AP). If the INPUT neuron produces a rapid stream of APs, then neuron 'C' will produce a brief burst of APs, then rest briefly, then produce a further brief burst of APs before resting again. This pattern continues as long as the INPUT neuron is producing APs. We can represent the activity like this: Activity in the INPUT neuron: IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII Activity in 'C': III III III III III III III III Assume all outputs = +1 for excitatory neurons and -1 for inhibitory neurons, and all thresholds = 1. TWO of the neurons labeled A-D are Tonically Active Neurons (TANs). TANs behave as though they are repeatedly receiving an output of +1. OUTPUT D B A INPUT Indicate for each neuron A-D whether it is excitatory or inhibitory and whether it is Tonically active or NOT Tonically active (1 mark for each correct answer) Inhibitory / Excitatory Tonically Active / Not Tonically active Neuron A: 0 0 0 0 Neuron B: 0 0 0 0 Neuron C: 0 0 0 0 Neuron D: 0 0 0 0

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