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Delay Discounting of Qualitatively Different Food Rewards in Rats  Amanda L. Calvert Washington University in St. Louis
[object Object],[object Object],[object Object],V = A /  (1 +  k   D ),
The slope of the discounting function is expressed by the free parameter  k  : V = A /  (1 +  k   D ). As  k  increases, the slope of the discounting function becomes steeper.  In other words, as  k  increases, the reward looses value more quickly with increasing delay. It appears that the rate at which delayed rewards are discounted is not invariant, even within individuals .
[object Object],Green, Myerson, & Ostaszewski, 1999
[object Object],Richards, Mitchell, De Witt, & Seiden, 1997   Green, Myerson, Holt, Slevin, & Estle, 2004 Rat
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],If reward quality affects reward value, then:
Two goals of the present experiment: ,[object Object],[object Object]
Preference Tests ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
 
 
 
Preference Tests ,[object Object],[object Object],[object Object]
Discounting Procedure ,[object Object],[object Object],[object Object],[object Object],[object Object]
Discounting Procedure ,[object Object]
Discounting Procedure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Discounting Procedure ,[object Object],[object Object],[object Object]
Discounting Procedure ,[object Object],[object Object],[object Object]

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Ms Talk Pt. 1

  • 1. Delay Discounting of Qualitatively Different Food Rewards in Rats Amanda L. Calvert Washington University in St. Louis
  • 2.
  • 3. The slope of the discounting function is expressed by the free parameter k : V = A / (1 + k D ). As k increases, the slope of the discounting function becomes steeper. In other words, as k increases, the reward looses value more quickly with increasing delay. It appears that the rate at which delayed rewards are discounted is not invariant, even within individuals .
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.  
  • 15.  
  • 16.  
  • 17.  
  • 18.
  • 19.
  • 20.
  • 21.
  • 22.
  • 23.