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. 2014 Mar;21(3):161–170. doi: 10.1101/lm.032730.113

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© 2014 Sehgal et al.; Published by Cold Spring Harbor Laboratory Press

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Figure 6. — Fear conditioning enhances intrinsic excitability in a subset of lateral amygdala neurons. (A) Cumulative frequency distribution of “number of action potentials (APs)” for LA neurons. Number of APs elicited in LA neurons from Cond-24hr rats (n = 28) is shifted to the right relative to neurons from Control (n = 28) or Cond-1hr (n = 13) rats. The rightward shift in Cond-24hr rats is only evident for a part of the curve indicating only a subset of LA neurons change as a result of conditioning. (B) Frequency histogram for number of APs. Approximately 32% of the LA neurons (9/28) have enhanced intrinsic excitability (i.e., those that fire more APs than the most excitable LA neuron from a Control rat) 24 h following fear conditioning. For both graphs, dashed line indicates the maximum number of APs fired by a LA neuron from a Control rat.