What is the peak photoreceptor absorption spectra of a S cone?

What is the peak photoreceptor absorption spectra of a S cone?

• A. 507 nm
• B. 426 nm
• C. 530 nm
• D. 557 nm

Answer: (B)

The peak photoreceptor absorption spectrum of a S cone, which is sensitive to short wavelengths, occurs at approximately 426 nm. This wavelength correlates with the spectrum of blue light, which is primarily detected by S cones. In the context of color vision, S cones play a key role by allowing the perception of colors in the blue range of the spectrum. The other wavelengths listed correspond to the peak absorption of different types of cones: M cones typically have a peak responsiveness around 530 nm (green), and L cones peak at about 557 nm (red). The value of 507 nm is more commonly associated with the peak of rods, which are not directly involved in color vision but rather in low-light vision. Understanding this distinction between cones (S, M, L) and rods is crucial in visual perception.

The peak photoreceptor absorption spectrum of a S cone, which is sensitive to short wavelengths, occurs at approximately 426 nm. This wavelength correlates with the spectrum of blue light, which is primarily detected by S cones. In the context of color vision, S cones play a key role by allowing the perception of colors in the blue range of the spectrum.

The other wavelengths listed correspond to the peak absorption of different types of cones: M cones typically have a peak responsiveness around 530 nm (green), and L cones peak at about 557 nm (red). The value of 507 nm is more commonly associated with the peak of rods, which are not directly involved in color vision but rather in low-light vision. Understanding this distinction between cones (S, M, L) and rods is crucial in visual perception.