1. Which section of the brain is most active when we feel happy?

      left frontal area   frontal area
      right frontal area   back area
  2. What was put on the skull of the experiment participant for the test?

      electric cap   electrodes
      water   mental wires
  3. How was the experiment conducted?

       by measuring which part of the brain gives out more oxygen    by measuring which part of the brain gives out more energy
        by measuring which part of the brain gives out more lights    by measuring which part of the brain gives out more electricity
  4. How old is the youngest participant for the experiment?

      2-day-old   2-year-old
      2-month-old   2-hour-old