Reflexivity without identity matching training: A first demonstration

Until now, the equivalence property of reflexivity—matching physically identical stimuli to themselves after training on a set of arbitrary matching relations—has not been demonstrated in any animal, human or nonhuman. Previous reports of reflexivity have either implicitly or explicitly involved reinforced training on other identity matching relations. Here we demonstrate reflexivity without prior identity matching training. Pigeons received concurrent successive matching training on three arbitrary matching tasks: AB (hue–form), BC (form–hue), and AC (hue–hue with different hues in the A and C sets). Afterwards, pigeons were tested for BB (form–form) reflexivity. Consistent with the predictions of Urcuioli's ( 2008 ) theory, pigeons preferentially responded to B comparison stimuli that matched the preceding B sample stimuli in testing (i.e., BB reflexivity). A separate experiment showed that a slightly different set of arbitrary matching baseline relations yielded a theoretically predicted “anti‐reflexivity” (or emergent oddity) effect in two of five pigeons. Finally, training on just two arbitrary successive matching tasks (AB and BC) did not yield any differential BB responding in testing for five of eight pigeons, with two others showing reflexivity and one showing antireflexivity. These data complement previous findings of symmetry and transitivity (the two other properties of equivalence) in pigeons.     

The ancestor effect: Thinking about our genetic origin enhances intellectual performance

The present research hypothesizes that thinking about one's genetic origin (i.e. ancestors) provides people with a positive psychological resource that increases their intellectual performance. To test this line of reasoning, we manipulated whether participants thought about their ancestors or not (manipulation of ancestor salience), and measured their expected as well as actual intellectual performance in a variety of intelligence tasks. Four studies supported our assumptions: participants show higher expected (Study 1) and actual intellectual performance (Studies 2–4) when they are reminded about their ancestors. We also have initial evidence that this effect may be fuelled by increased levels of perceived control and promotion orientation. Theoretical and practical implications are discussed. It is certainly desirable to be well descended, but the glory belongs to our ancestors. (Plutarch 46–120 AD) Copyright © 2010 John Wiley & Sons, Ltd.     

Les Principes Philosophiques Du Christianisme

Sans résumé