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Chapter 1: Introduction – Historical Developments in the study of the Mind • Learning theory can trace its roots to the philosophy of Rene Descartes (15961650). – Cartesian Dualism • Two classes of human behavior – Involuntary (Body) – Voluntary (Mind) More Historical developments • Nativism vs. Empiricism – Does this argument sound familiar? • Nature/Nurture argument • Human behaviors as a result of Nature? • Human behaviors as result of Nurture? • Are these concepts every truly separate? – Always an interaction of nature and nurture More Historical antecedents • Descartes believed that the mind did not function in an orderly and predictable manner. – To maintain Free will? • The Empiricists disagreed. – Hobbes – the principle of hedonism • People do things in the pursuit of pleasure and avoidance of pain. • Empiricists concept of association • Believed all contents of the mind were learned – attempted to explain how • knowledge was derived through the association of sensory stimuli. • Led to the Four Tenets of Association Theory Four Tenets of Association Theory • 1) Temporal Contiguity – We are better able to associate stimuli that occur close together in time. • 2) Intensity – More intense stimuli are more easily associated. • 3) Frequency – The more often we are presented with stimuli increases their ability to be learned. • 4) Similarity – Some things seem to belong together • The Dawn of the Modern Era – The Darwinian Revolution – Comparative Cognition and the Evolution of Intelligence • First let’s discuss the theory of evolution Theory of Evolution • Charles Darwin (1809-1882) – • Origin of Species (1859) There is diversity in living things even within a species – – • We don't all look alike We don't all behave alike Those traits can be passed on from parent to offspring – – • Darwin didn't know how. Mendel did = Genes There is a struggle to survive – – Many organism mass produce offspring and few make it. There is fairly high infant mortality for humans as well in some places Theory of Evolution • Organisms that are best suited to their environment have a survival advantage – Doesn't necessarily mean the strongest – At times it might be good to be small and quiet (early mammals) – Survival of the fittest • Those with a survival advantage will produce more offspring and pass their traits on to those offspring, thus the population will begin to have those particular traits – Natural selection – Already known from "unnatural selection" breeding techniques • Large boar with large sow = large piglet. Influence of Darwin on Psychology • Darwin argued that human intelligence evolved from lower organisms. – The human mind is a product of evolution. • George Romanes (1848-1894) – Animal Intelligence – tended to evaluate how an animal behaved according to how he would have behaved in a similar situation • Freeing trapped ants • Anthropomorphism? – Not good science • C. Lloyd Morgan (1852-1936) was against flippantly attributing human abilities to animals. – Morgan’s canon • “in no case may we interpret an action as the outcome of the exercise of a higher psychical faculty if it can be interpreted as the outcome of the exercise of one which stands lower in the psychological scale.” Animal Models • Darwin’s ideas allowed for the use of animal models • Modern Psychology, Neuroscience, and Medical Research relies heavily on animal models. – Why? • Methodological aspects of the study of learning • Learning is an Experimental Science • What is the difference between an experimental approach and an observational approach to science? • Why emphasize experimentation in learning research? – Observation alone cannot tell us if a behavior is learned. – There are always alternative explanations that are not ruled out. • Put a rat in an operant chamber and provide a pellet of food for every lever press. • I see that lever pressing goes up. • Conclude that reward increases behavior? • Known as the learning performance distinction • The learning and Performance distinction. – There can be many reasons for changes in behavior, that are unrelated to learning. • Motivation • Fatigue – We must rule out these alternative explanations with control groups – Also - sometimes learning can occur without an immediate change in performance. • Childs knowledge of driving? • Tolman and Honzik (1930) HNR= Hungry not Rewarded, HR = Hungry Rewarded, HNR-R, Hungry not Rewarded until day 11 • The General-Process Approach to the Study of Learning • Thus, comparative psychologists tend to study things using simple preparations, and subjects that are cheap, and cooperative. – Operant chambers – Rats – pigeons