Question

The magnitude of the response of photoreceptors to a range of light intensities can be described by what we call the v-log(I) curve. Which statement(s) is/are correct about the curve shown as an example in your ERG protocol?

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The magnitude of the response of photoreceptors to a range of light intensities can be described by what we call the v-log(I)

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Answer #1

The correct statements are A and B.

A) When the FLASH STRENGTH graph is viewed it gives us a SIGMOID curve. A range of different light intensities are projected and the photoreceptors respond differently but the response becomes saturates when the light itensity is nearly 1000 times stronger than the lowest light intensity.

B) As observed in the sigmoid curve, after a flash stength of 1000 all the responses converge and forms a horizontal straight line parallel to x-axis depicting that there is no further increase in response strength when increasing the light intensity.

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