BIOL-108 Lecture Notes - Lecture 3: Serendipity, Adaptive Learning, Learning
Document Summary
Habituation: process of responding less strongly over time to repeated stimuli. Learning to ignore irrelevant, nonharmful stimuli: adaptive. Conserve energy and attentional resources: simplest and earliest form of learning. Fetus at 32 wks habituate to vibration in wombdue to changes in cns. Sensitization: responding more strongly to a stimulus after repeated exposure, most likely if stimulus is dangerous, noxious or both. Classical conditioning: creating associations between 2 stimuli, associative learning, discovered by pavlov while studying digestive mechanisms: serendipity. No reflexive salivation response to sounds (cs) only foods (ucs) Classical conditioning occurs in 3 phases: acquisition. Loss of cr to cs: spontaneous recovery. With increased repetitions of cs and ucs. If ucs intense or aversive require only 1 pairing. Depends on timing between cs and ucs: forward short delay (simultaneous) vs forward trace pairing (1-3 sec) Simultaneous = not as good as forward: most effective if close in time.
