Gilchrist and Nesburg's study

• Aim 


  To investigate how motivation affects a person's perception
• Method


  26pp go without food for 20 hours. Control group were not deprived of food. Shown images of meals with a projector and then the brightness was turned all the way down. They were asked to adjust the brightness back to the same level that it was before.
• Results


  Control = little difference in brightness from memory. Experimental = judged pictures to brighter the hungrier they become
• Conclusion


  Hunger can affect the way people perceive images of food which suggests motivation can affect perception.