original: When animals or people freerun, experiments can be done to see what sort of signals, known as zeitgeber, are effective in entrainment.
simplifications: When animals or people freerun, experiments can be done to see what sort of signals are effective in entrainment. When animals or people freerun, experiments can be done to see what signals are good for entrainment. When animals or people freerun experiments can occur to see what signals are effective in entrainment. Experiments can be done on free-running people and animals to see what sort of signals are effective in entertainment. When animals or people freerun, experiments can reveal which signals, known as zeitgeber, are effective in entrainment. When animals or people freerun, experiments can be done. They can see what sort of signals, known as zeitgeber, work in entrainment. When animals or people freerun, it is possible to see what kinds of signals are used help them sync up with an external rhythm. When animals or people freerun, experiments can be done to see what sort of signals are effective in entrainment. Experiments can be made when animals or people freerun to see what kind of signals, known as zeitgeber, are useful in trainings. When humans or animals run wild, experiments can be done to see what sort of signals are effective in entrainment.