PSY 341 Lecture Notes - Lecture 24: Syllogism, Deductive Reasoning, Modus Ponens
8 Dec 2016
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Do we seek disconfirmation: watson (1966, 1968) Give people a numeric series: 2, 4, 6. Tell them: series generated using a rule. Ask them: discover rule by proposing trios of your own. Get feedback on whether series follows rule. To discover the rule, we need to employ disconfirmatory processes to rule out alternative hypotheses. Involved in belief perseverance: tweney et al. (1981) Read suicide notes; decide which are authentic (all = fake) Given predetermined feedback: highly accurate or inaccurate. Debriefing: participants told accuracy feedback was bogus. Later, rate own social sensitivity as above/below average. Feedback caused retrieval of confirmatory episodes in which participants had been either socially perceptive or not. Role of confirmation biases in propaganda beliefs. Reasoning: deductive logic: two kinds of investigations. Conditional (if, then) statements: formal logic systems used as normative models. Determined validity of argument by examining only a(cid:396)gu(cid:373)e(cid:374)ts" form/structure and using some inference rules: big question. Categorical syllogisms: all have two premises and one conclusion.
