The phenomenon whereby sensory systems become less sensitive to unchanging stimuli is known as what?

The correct term for the phenomenon where sensory systems become less sensitive to unchanging stimuli is sensory adaptation. This process occurs as a way for the sensory system to tune out repetitive, unchanging environmental stimuli, allowing an organism to focus on changes in stimuli that are more likely to be significant to survival or immediate attention.

For example, when you first enter a room with a strong smell, you may notice it immediately. However, after being in the room for a while, you may no longer consciously register the odor. This is because your sensory receptors have adapted to the constant exposure, reducing their response. Sensory adaptation helps prevent sensory overload and allows individuals to maintain awareness of novel stimuli that could indicate changes in their environment.