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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: Prog Retin Eye Res. 2009 May 13;28(4):263–288. doi: 10.1016/j.preteyeres.2009.05.001

Figure 20.

Figure 20

Threshold for spikes in a guinea pig ganglion cell in vitro is 2-fold higher than graded potential (Dhingra & Smith, 2004). The experimental task was to detect a spot of light (100 ms, 500 μm, 2 Hz) from background in a single-interval two-alternative forced-choice task. Threshold was defined the contrast that gave 68% correct. The ideal observer allowed a a relatively unbiased comparison between simultaneously recorded spikes and graded potential (see text). Compare to Figure 6. Redrawn from Dhingra & Smith (2004).