procedure

• skinner box 


  a utilised controlled environment with a lever that the rats could press
• positive reinforcement 


  a food pellet was delivered when the rats pressed the lever
• negative reinforcement 


  an electric shock was stopped when the rats pressed the lever
• punishment 


  a mild electric shock was delivered when the rat pressed the lever
• behaviour recording 


  frequency the rats were pressing the lever was recorded to measure the reinforcement