C&LH 4-26 - 1 4/26 (remainder of ch. 9) A. Factors that...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
4/26 (remainder of ch. 9) A. Factors that affect responding or learning in traditional instrumental/o perant paradigms: 1. magnitude of X -- respond faster (and learn faster) for bigger X 2. delay of X different paradigm--Collier lab—46-hr delay between 1 press (bar withdrawn then) and access to food (the X)—learned perfectly; but not deprived and in control of all their resour ces. Learn faster if delay is shorter. 3. prior experience with X -- contrast effects Two phases: a preshift and a postshift; get stable behavior with one mag of X in phase 1, then shift mag of X in phase 2. Responding is NOT determined by absolute mag of X in phase 2 but by relative value of X in phase 2 compared with phase 1 . Crespi (1942) --straight alley runway; running speed was the measure 4 groups : (DRAW) Preshift-Postshif t small X-small X--Control large X-large X --Control small X-large X-"joy" or "elation" effect ( overshoot)-- Positive contrast large X-small X--"depression effect ( undershoot)-- Negative contrast Thought contrast effects were emotion induced. **This study shows that absolute mag of X is not what controls responding but present mag relative to what mag of X the animal had experienced before. Contrast effects are relatively transient. Like perception--poor children see a disk the size of a quarter perceived it as being larger than rich children; relate to Rescorla-- Wagner--if US bigger than expected get faster learning or change in 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
V; if US smaller than expected, get slower increase in V. B.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/05/2008 for the course PSYCH 311 taught by Professor Rovee-collier during the Spring '06 term at Rutgers.

Page1 / 4

C&LH 4-26 - 1 4/26 (remainder of ch. 9) A. Factors that...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online