S - S or S - R ?

• Second-order conditioning

  • Start with standard pairing of CS1 and US
  • CS1 ---> CR
  • Then pair CS1 + CS2
  • Test: CS2 ---> CR
  • Then devalue US, or extinguish CS1
  • Test: CS2 ---> CR

• Whether CS connects to US or CR depends on which is more salient

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