Lecture 5-Outline - Experimental Psychology Learning...

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Experimental Psychology- Learning Lecture 5 Outline II. Excitatory Conditioning A. Definition Excitatory Classical Conditioning- the organism learns associations between the CS and US and can anticipate the presence of the US. B. Terminology Classical conditioning is affected by the CS-US timing 1. Conditioning Trial- single trial with 1 US and 1 CS 2. Training Session- a battery of CS-US trials- session is a bunch of trials 3. Intertrial Interval- the end of 1 trial to the start of the next 4. Interstimulus Interval- time from start of CS to the start of the US (ISI) - this is important! C. Training Procedures 1. Short-delayed- Short ISI and CS and US overlap- initiation of CS and US are very close 2. Trace- Larger ISI and no overlap (trace interval) - more distance between onset of CS and US 3. Long-delayed- Large ISI and overlap between CS and US 4. Simultaneous- No ISI and total overlap 5. Backward- US precedes CS Test trial- CR assessed by presenting CS alone (2 questions on test) Quantifying the CR: Magnitude- how much? Probability- likelihood? Latency- when? D. Controls in Excitatory Conditioning “Control” Complications : In Habituation- was there prior exposure? In Classical Conditioning- is it a new association? Pseudoconditioning- is the CR due to sensitization? For example repeated meat powder sensitizes drooling -Make sure there is no habituation/sensitization or prior association Controls in Classical Conditioning: Random Control: GOOD CS and US occur randomly in same trial- changing temporal pattern Can still produce learning Sometimes it predicts the presence sometimes absence sometimes presented together Explicitly Unpaired Control: BEST US and CS presented on different trials- always!
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Far apart to prevent associations How far depends upon the system Example: Eyeblink (close together) vs. Taste aversion (spread out at least 12 hours)
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