1. C. Asynchronous background input alone drives a low level of firing even in the absence of any signaling input, as seen by the two spikes that occur in the 1 second sample trace. The peaks of the action potentials have been clipped at 0 mV.
Source: Theoretical Approaches to Neuroscience: Examples from Single Neurons to Networks, Principles of Neural Science, Fifth Editon
Citation: Kandel ER, Schwartz JH, Jessell TM, Siegelbaum SA, Hudspeth AJ, Mack S. Principles of Neural Science, Fifth Editon; 2012 Available at: Accessed: October 20, 2017
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