The diagram shows the synaptic connections of two different photoreceptors found in the human retina.
Which of the following statements correctly explains how the wiring in Circuit A or Circuit B affects the light sensitivity or visual acuity of these photoreceptors?
Circuit AAA has low visual acuity because multiple Photoreceptors XXX converge on a single bipolar neurone, meaning separate points of light cannot be distinguished by the brain.
Circuit AAA has low light sensitivity because spatial summation prevents generator potentials from reaching the threshold required for an action potential.
Circuit BBB has high visual acuity because multiple Photoreceptors YYY converge on a single bipolar neurone to allow precise localization.
Circuit BBB has high light sensitivity because a single Photoreceptor YYY connects directly to its own bipolar neurone, maximizing spatial summation.