John’s brother praises him whenever John says “Honda” while…

John’s brother praises him whenever John says “Honda” while looking at a picture of a Honda. If he says “Toyota,” “Volkswagen,” or any other brand he does not praise him. Eventually, John learns to say “Honda” while looking at a picture of a Honda. John’s brother is using:

Scooby Doo refuses to enter the graveyard for one Scooby Sna…

Scooby Doo refuses to enter the graveyard for one Scooby Snack.  Velma offers him five Scooby Snacks to be issued after he enters the graveyard.  Scooby complies.  She gives Scooby five Scooby snacks after he enters the graveyard.  Which parameter of reinforcement did Velma manipulate?