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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Neurobiol Learn Mem. 2012 Dec 22;101:8–18. doi: 10.1016/j.nlm.2012.12.013

Fig. 1.

Fig. 1

Example of a frequency response area (FRA) recorded from the primary auditory cortex of the waking rat. Threshold is defined as the lowest sound level (dB SPL) that elicits a response. The frequency that elicits this response is the characteristic frequency (CF). The BFmax is defined as the frequency that elicits the greatest response (spikes per second above pre-tone activity). The breadth of tuning is measured at 10 dB above the evoked threshold (BW10).