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The American Federation of Labor only represented which group of people?

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A visual neuron's steady-state response a. is the total number of neural spikes contained in the first 100 ms of its response.b. requires stimuli to be presented briefly.c. is found only in simple cells.d. is a cell's firing-rate observed a short time after the onset of a provocative stimulus.e. is observed only when oriented contours are used as stimuli.

Consider an on-centre retinal opponent cell whose centre is selective for 'red wavelength light and whose surround is selective for 'green' 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 black spot on a black background. b. a black spot on a white background. c. a white spot on a white background. d. a white spot on a black background. e. a red spot on a green background.

One plausible explanation for why illusory blobs are seen in the 'white crosses on a black background' version of the Hermann grid is that a. on-centre cells are more active at the light intersections of the grid than off-centre cells.b. off-centre cells are more active at the light intersections of the grid than on-centre cells.c. on-centre cells are more active at the light bars of the grid than off-centre cells.d. off-centre cells are more active at the light intersections of the grid than at the light bars of the grid.e. on-centre cells are more active at the light intersections of the grid than at the light bars of the grid.

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