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. Author manuscript; available in PMC: 2010 May 1.
Published in final edited form as: Vision Res. 2008 Nov 7;49(10):1144–1153. doi: 10.1016/j.visres.2008.09.018

Figure 1. Gain mechanisms of attention in single-cell responses to contrast.

Figure 1

The black and red curves represent the contrast response functions of a hypothetical neuron when attention is directed away from and towards a stimulus, respectively. (a) Contrast gain, attention shifts the neuron's contrast response function toward lower contrast. (b) The effect is greater near the middle of the contrast response function than at low and high contrasts. (c) Response gain, attention multiplies neuron response by a constant factor; (d) the attentional effect increases with contrast.