Explain how a potentially harmful stimulus can contribute to a subjective pain experience, from detection through brain processing.

### What a good answer covers - Nociceptors detect potentially harmful stimuli, a process called nociception. - Signals travel through the spinal cord along ascending pathways. - Several brain regions interpret pain signals and contribute to subjective pain. - Descending brain pathways can modulate pain intensity and perception. ### The concept Detection, transmission, and experience are connected stages, but they are not identical. Nociception describes detection and signaling; pain is the subjective experience generated through brain processing. Emotional states can influence that experience. ### Terms - **Nociceptor**: a sensory neuron that detects noxious stimuli. - **Ascending pathway**: a route carrying signals toward the brain. - **Descending pathway**: a route from the brain that can influence pain processing. - **Modulation**: adjustment of a signal's intensity or effect. ### Remember Trace pain from detection, to spinal transmission, to brain interpretation, then consider modulation.