An electroretinogram primarily records the response to what stimulus?

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Multiple Choice

An electroretinogram primarily records the response to what stimulus?

Explanation:
An electroretinogram measures the retina’s electrical response to light stimuli. When light hits photoreceptors (rods and cones), they change ion flow and generate an electrical signal that travels through the retina. The ERG captures the summed currents from these cells, producing characteristic waves: the a-wave reflecting photoreceptor activity and the subsequent b-wave reflecting bipolar and Müller cell activity. Because the test relies on light to evoke retinal activity, the primary stimulus is light. Stimuli like sound, temperature, or pressure don’t directly drive the retinal electrical response measured by an ERG.

An electroretinogram measures the retina’s electrical response to light stimuli. When light hits photoreceptors (rods and cones), they change ion flow and generate an electrical signal that travels through the retina. The ERG captures the summed currents from these cells, producing characteristic waves: the a-wave reflecting photoreceptor activity and the subsequent b-wave reflecting bipolar and Müller cell activity. Because the test relies on light to evoke retinal activity, the primary stimulus is light. Stimuli like sound, temperature, or pressure don’t directly drive the retinal electrical response measured by an ERG.

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