Final answer:
Blinkers benefit from the human eye's attraction to movement and changes in light, signaling important information like directional changes in traffic, which are detected by our rods and color-sensitive cones.
Step-by-step explanation:
One benefit of a "blinker" or any visual signal is that the human eye is attracted to movement and changes in light. This attraction to movement and changes in light is particularly noticeable in road safety, where blinkers indicate a vehicle's direction change, catching the attention of other drivers and pedestrians. The eye's four types of light receptors — rods and three types of color-sensitive cones — play a role in this process. Rods are beneficial for detecting movement, especially in low light conditions, whereas cones are responsible for discerning colors and fine details. As such, blinking lights are an effective way to convey important navigational information on the road.
The recognition of light and movement is rooted in the human visual system's evolution, which favors stimuli that indicate changes in the environment. This can be seen in various contexts, such as infants being drawn to contrasting colors or complex patterns and adults responding to lighting cues stage directors use to evoke emotional responses from an audience. Therefore, in both nature and engineered environments, light and movement are powerful tools for communication.