II. Vision: D. Perception: 4. Temporal

4. Temporal
   1. Temporal summation
      
      
      Defined by Bloch's Law and Ricco's Law
       
   2. Intermittent stimuli
      1. Critical fusion frequency (CFF) - standard value given as 60 Hz
      2. Apparent motion
      3. Wheel motion - the difference between apparent motion and fusion
   3. Frame of reference
   4. Gestalt law: Common fate
      • Form from motion