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. Author manuscript; available in PMC: 2012 Oct 17.
Published in final edited form as: Eur J Neurosci. 2004 Feb;19(4):898–906. doi: 10.1111/j.0953-816x.2004.03117.x

Figure 2.

Figure 2

a, Circadian rhythm in electrical activity of a representative OB neuron. Insets show 10 superimposed action potentials recorded at different times over 10 days to illustrate the reliable discrimination of the activity of a single OB cell. b, Chi-squared periodogram analysis of the firing pattern from the cell in a shows a dominant frequency at 22.7 h. c, Circadian firing pattern of an SCN neuron recorded for 16 days on a different multielectrode array. Insets show small action potentials, typical of SCN neurons. The period estimate for this cell, shown in d, was 29.2 h.