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. Author manuscript; available in PMC: 2012 Jan 22.
Published in final edited form as: J Neurosci. 2011 Jun 8;31(23):8654–8658. doi: 10.1523/JNEUROSCI.0504-11.2011

Figure 1. Sensitivity to ON and OFF channels.

Figure 1

(a) Stimulus sequence to isolate ON and OFF channels. Observers reported the orientation of the grating using 2AFC (H vs V) (b) Contrast threshold for increment and decrement gratings for 16, 24 and 32 cycles per degree. (c) Contrast threshold measured for increment and decrement gratings presented 0s and 0.1s following positive and negative step changes. (d) Contrast threshold for fast ON and fast OFF sawtooth modulation at 8Hz.