How is GSR affected by IR light?

When discussing how GSR (galvanic skin response) is affected by infrared (IR) light, the correct understanding revolves around the interaction between the skin and the light. GSR measures the electrical conductance of the skin, which can be influenced by moisture levels, temperature, and various stimuli, including light exposure.

When IR light is present, it is absorbed by the skin's tissues, leading to an increase in temperature and potentially affecting moisture levels due to increased perspiration. The absorption of IR light is critical because it can elevate the skin's temperature and may enhance perspiration rates, which are both key factors in altering the GSR reading.

The other interactions—reflection, transmission, and scattering—do not significantly impact the GSR in the same way. Reflection refers to light bouncing off a surface without penetrating it, transmission means the light passes through without much interaction, and scattering implies a diffusion of light without absorption. In contrast, the absorption process directly influences the physiological changes that alter GSR measurements. Thus, understanding the skin's interaction with IR light through absorption is essential for comprehending how GSR readings can change under IR exposure.