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. Which of the following statements is true? a. It is not possible for experimenters to map out the inhibitory lobes of receptive fields because cells cannot fire negatively.b. A simple cell with a single excitatory lobe and a single inhibitory lobe cannot be made to respond to a light bar stimulus.c. Complex cells are needed to encode contour orientation because simple cells cannot perform this job on their own.d. A simple cell cannot distinguish between a low contrast contour at the cell's preferred orientation and a higher contrast contour at a slightly different orientation. e. Most simple cells respond to a range of contour orientations including the one that is orthogonal to the cell's preferred orientation

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