Which of the following is a good example of neuronal control of behaviour?

1) Over generations of breeding silver foxes have become less fearful or people.

2) Progesterone in mice suppresses parental behaviour.

3) Sound pressure from bats flying past moths stimulates receptors and neurons to cause contractions of the muscles in the wing.

4) Domestic dogs will salivate upon hearing a bell if this reliably proceeds the arrival of food.