Vehicle horn horn. Bicycles often have a classic "bulb horn", operated by squeezing a rubber bulb attached to a metal horn. Squeezing the bulb forces air through a steel reed located in the throat of the horn, making it vibrate, producing a single note. The flaring horn matches the acoustic impedance of the reed to the open air, radiating the sound waves efficiently, making the sound louder. Other types of horns used on bicycles include battery-operated horns (sometimes even car horns on 12-volt circuits are incorporated) and small air horns powered by a small can of compressed gas. Oliver Lucas of Birmingham,
Bedwetting alarm stop urinating, and travel to the bathroom. After continued pairing of the alarm sound (US) with the feeling of a full bladder (NS), the previous NS of feeling a full bladder becomes the CS and elicits the waking response (CR) of waking up to go use the bathroom and urinate. In the operant conditioning paradigm the alarm sound serves as a noxious stimuli added to the environment, effectively implementing a positive punishment procedure whenever the individual activates the alarm by urinating. This eventually causes an avoidance response from the individual, maintain the behavior through negative reinforcement by avoiding the alarm