Beside the blind spot

At the fovea

At the retinal periphery

Parafoveally

At the region of the retina with large retinal ganglion cells

reduced cGMP levels in all cones.

 damage to the outer segments of all cones.

damage to the outer segments of rods alone.

damage to the outer segments of one type of cone.

 a reduction on cGMP levels in reds.

Light/Dark, Red/Blue and Green/Yellow are the opposing wavelengths involved

Red/Green and Blue/Yellow are the two opposing wavelengths involved

Light/Dark, Red/Green and Blue/Yellow are the opposing wavelengths involved

Red and Green are the only opposing wavelengths 

Red/Blue and Blue/Green are the two opposing wavelengths involved

allow for improved detecion of low light levels in the dark

both send information to bipolar cells which relay to RGCs

allow for the opponent wavelength sensitivity in RGCs with input from rods

are responsible for direct flow of information from photoreceptor to RGCs

are responsible for indirect flow of information from photoreceptors to RGCs

are never inhibited by light anywhere across the retina.

are excited by light in the RF surround and inhibited by light in the RF centre.

are excited by input from cones and inhibited by input from rods.

are excited by light in the RF centre and in the RF surround.

are excited by light in the RF centre and inhibited by light in the RF surround.

form either part of the Red / Green system or the Blue / Yellow system for wavelength selectivity.

form either part of the cone pathway or the red pathway for inputs to RGCs.

form either part of the foveal pathway or the non-foveal pathway for information flow from receptors to RGCs.

only receive input from para-foveal regions.

form either part of the Red / Green / Blue / Yellow system or the ON / OFF system for wavelength selectivity.

closely spaced objects.

the contrast between an area and the background.

the absolute light intensity.

the size of a stimulus.

colour and movement.

This accounts for the colour-opponent centre-surround system in RGCs

This accounts for the centre-surround system in foveal amacrine cells

This is only correct in humans and not in any other species.

This accounts for the centre-surround system in foveal RGCs

This is not correct as such cells are found throughout the retina.

In an RGC with an ON centre RF, light in the RF centre produces no activity in the RGC.

In an RGC with an ON centre RF, light in the RF centre excites the RGC.

The RF centre and surround cause temporal summation of action potentials in the RGC.

In an RGC with an ON centre RF, light in the RF centre inhibits the RGC.

In all RGCs light in the RF centre stimulates the RGC.

Will, but only in ON-centre RFs, elicit the opposite effect to that elicited by the RF centre

Will, in 50% of RGCs, elicit the opposite effect to that elicited by the RF centre

Will, but only in wavelength-sensitive RFs, elicit the opposite effect to that elicited by the RF centre

Will, but only in OFF-centre RFs, elicit the opposite effect to that elicited by the RF centre

Always elicit the opposite effect to that elicited by the RF centre