Consider an on-centre retinal opponent cell whose centre is selective for 'blue' wavelength light and whose surround is selective for 'yellow' wavelength light. Assume that the spots in the following stimuli are the same size and in the same position as the centre of the receptive field. Which of the following stimuli will produce the greatest response? a. A yellow spot on a blue background.b. A blue spot on a yellow background.c. A blue spot on a white background. d. A blue spot on a blue background. e. A yellow spot on a yellow background.

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