In a scotopic ERG, which waveform is labeled as "b"?

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Multiple Choice

In a scotopic ERG, which waveform is labeled as "b"?

Explanation:
In a scotopic (dark-adapted) ERG, the rod system drives the response. The first deflection you see is the a-wave, a negative-going dip mainly reflecting photoreceptor hyperpolarization. After that comes a large positive deflection—the B-wave—generated by activity in the inner retina, especially the ON-bipolar cells that respond to the input from rods (with support from Müller glia). So the waveform labeled as the B-wave is the positive bump following the a-wave, representing inner retinal processing in rod-driven vision.

In a scotopic (dark-adapted) ERG, the rod system drives the response. The first deflection you see is the a-wave, a negative-going dip mainly reflecting photoreceptor hyperpolarization. After that comes a large positive deflection—the B-wave—generated by activity in the inner retina, especially the ON-bipolar cells that respond to the input from rods (with support from Müller glia). So the waveform labeled as the B-wave is the positive bump following the a-wave, representing inner retinal processing in rod-driven vision.

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