Abstract
Zusammenfassung. Anschauliches Denken ist ein vitaler Bestandteil der menschlichen kognitiven Grundausstattung. Im psychologischen Labor blieben die Befunde zum Einfluß der Vorstellbarkeit des Materials auf die Leistung in Denkaufgaben allerdings inkonsistent. Ausgangspunkt der vorliegenden Arbeit ist die Annahme, daß die Uneinheitlichkeit der Ergebnisse zum anschaulichen Denken auf eine Konfundierung visuell-bildhafter und räumlicher Prozesse im Arbeitsgedächtnis zurückgeht. Wir geben einen Überblick über die neuere Forschung einschließlich eigener Ergebnisse, wobei wir uns auf deduktive Schlußfolgerungen konzentrieren. Aufgaben unterschiedlicher Modalität, die das räumliche Arbeitsgedächtnis zusätzlich belasten, interferieren demnach mit anschaulichem Denken, nicht aber rein visuelle Aufgaben. Zudem begünstigt einfache räumliche Vorstellbarkeit die Leistung beim Schlußfolgern, während rein visuelles Vorstellen sogar beeinträchtigend wirken kann. In Experimenten mit Hilfe funktioneller Kernspintomographie (fMRT) findet sich außerdem erhöhte Aktivierung in Hirnregionen, die mit räumlichem Arbeitsgedächtnis in Verbindung gebracht werden, nicht aber in Arealen des visuellen Arbeitsgedächtnisses. Anscheinend hat anschauliches Denken, im Gegensatz zur landläufigen Meinung, mit räumlichen und nicht mit visuellen Repräsentationen und Prozessen im Arbeitsgedächtnis zu tun.
Abstract. Imaginary thinking is a vital, basic element of human cognition. However, in the psychological laboratory, the findings regarding the effect of imageability on reasoning remain inconsistent. The starting point of the following work is the assumption that the inconsistencies arise from a confounding of visual and spatial processes in working memory. We give an overview of recent research (mainly on deductive reasoning), including our own results: secondary tasks of different modalities which preoccupy spatial working memory interfere with imaginary reasoning, whereas purely visual secondary tasks have no effect. Moreover, reasoning with materials that are easy to envisage spatially promote reasoning performance, while purely visual imageability can even impair reasoning. Furthermore, in studies using functional magnetic resonance imaging (fMRI), increased activation was found in brain regions that are associated with spatial working memory, but not in visual working memory areas. Apparently, imaginary reasoning - contrary to popular belief - has to do with spatial rather than visual representations and processes in working memory.
Literatur
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