a) Based upon how the neural membrane functions, briefly explain how electrical stimulation can cause a neuron to generate an action potential. Describe in one sentence a type of action potential that can be generated by electrical stimulation, but that cannot be generated by synaptic inputs. b) The central part of the retina consists largely of cones, which are responsible for colour vision in normal sight. However, presently available retinal prostheses are not able to reliably provide a perception of colour for people implanted with these devices. Explain why people with a retinal prosthesis are currently unable to reliably perceive colour.

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