Final answer:
The parietal lobes are involved in recognizing when someone is scratching your back.
Step-by-step explanation:
The brain lobes involved in recognizing when someone is scratching your back are the parietal lobes.
The parietal lobes are located behind the frontal lobes at the top of the head and they are responsible for sensation, including touch. They process somatosensation, which includes touch sensations like pressure, pain, heat, and cold.
When someone scratches your back, the sensory information is first received by the receptors in your skin. The signals travel through your peripheral nervous system to the parietal lobes of your brain, where the sensation of being scratched is processed and recognized.