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 run free , experiments can be done to study the effects of signals known as zeitgeber in entrainment . when animals or people freerun , experiments can be done to see what sort of signals , known as zeitgeber , are effective in entertainment . experiments can be done to see what type of zeitgeber are effective in entertainment when animals and people free run . experiments of animals or people freerunning show signals or zeitgeber are effective in entrainment . when animals or people freerun , experiments can be done to see what sort of signals , known as zeitgeber , are effective in entrainment . when animals or people freerun , experiments can be done to see what sort of signals , known as zeitgeber , are useful in entrainment . experiments can be done on people and animals while they are freerunning in order to find out what sort of signals -lrb- known as zitgerber -rrb- are effective in entrainment . when people or animals free run , experiments can be done to see what signals are effective in entrapment .