Parents get physical with their misbehaving children in public much more than they show in laboratory experiments and acknowledge in surveys, according to one of the first real-world studies of caregiver discipline. The study, led by Michigan State University’s Kathy Stansbury, found that 23 percent of youngsters received some type of “negative touch” when they failed to comply with a parental request in public places such as restaurants and parks. Negative touch included arm pulling, pinching, slapping and spanking.