What is the initial negative wave on a scotopic or photopic ERG?

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Multiple Choice

What is the initial negative wave on a scotopic or photopic ERG?

Explanation:
In an ERG, the very first deflection after the light stimulus is negative because it reflects photoreceptor hyperpolarization as they respond to light. This early negative component appears in both scotopic (rod-dominated) and photopic (cone-dominated) recordings and is known as the a-wave. It mainly represents the outer retinal photoreceptors' activity. The next wave, which is positive, comes from the ON-bipolar cells (and Müller cells) and is called the b-wave. So the initial negative deflection in scotopic and photopic ERGs is the a-wave.

In an ERG, the very first deflection after the light stimulus is negative because it reflects photoreceptor hyperpolarization as they respond to light. This early negative component appears in both scotopic (rod-dominated) and photopic (cone-dominated) recordings and is known as the a-wave. It mainly represents the outer retinal photoreceptors' activity. The next wave, which is positive, comes from the ON-bipolar cells (and Müller cells) and is called the b-wave. So the initial negative deflection in scotopic and photopic ERGs is the a-wave.

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