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Unformatted text preview: timulus-stimulus learning
C. Second-order conditioning
Stage 1 Stage 2 CS1→US CS2 →CS1
CS2 comes to evoke a CR - CS2 enters into an association with CS1, which in turn excites a memory of
the US as a consequence of stage 1 training. - Rashotte, Griffin & Sisk (1977): Autoshaping procedure with pigeons. White
and blue key-lights as CS1 and CS2. CS1 extinguished after stage 2. Results
showed that CR to CS was weakened by this treatment. Supports the above
- Rizley & Rescorla (1972): Conditioned suppression procedure with rats. Tone
and light as CS1 and CS2. They also extinguished CS1 after stage 2. Results
showed that CR to CS was NOT weakened by this treatment. Contradicts the
- Rescorla (1980): When CS1 and CS2 are similar = CS2-CS1 learning. When
CS1 and CS2 are dissimilar = CS1-CR learning.
8 Nature of US representations
Two characteristics/properties of US representations:
(1) Specific – Characteristics that make the US unique and recognizable (e.g.
its duration, flavor)
CS can become asso...
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- Spring '07