The aim of this article is to strengthen links between cognitive brain research and formal logic. The work covers three fundamental sorts of logical inferences: reasoning in the propositional calculus, i.e. inferences with the conditional “if...then”, reasoning in the predicate calculus, i.e. inferences based on quantifiers such as “all”, “some”, “none”, and reasoning with n-place relations. Studies with brain-damaged patients and neuroimaging experiments indicate that such logical inferences are implemented in overlapping but different bilateral cortical networks, including parts of the (...) fronto-temporal cortex, the posterior parietal cortex, and the visual cortices. I argue that these findings show that we do not use a single deterministic strategy for solving logical reasoning problems. This account resolves many disputes about how humans reason logically and why we sometimes deviate from the norms of formal logic. (shrink)

Developmental psychologists have often portrayed young children as stubborn autodidacts who ignore the testimony of others. Yet the basic design of the human cognitive system indicates an early ability to co-ordinate information derived from first-hand observation with information derived from testimony. There is no obvious tendency to favour the former over the latter. Indeed, young children are relatively poor at monitoring whether they learned something from observation or from testimony. Moreover, the processes by which children and adults understand and remember (...) a sequence of events appear to be similar, whether they witness that sequence or are told about it. Children’s early receptivity to testimony raises the question of whether and how children discern what testimony is reliable. Arguably, before the emergence of reflective judgement, children are equipped with a tacit filtering device. To be understood, any new piece of testimony typically needs to be consistent with, and integrated into, what is already known about the topic in question. Children’s impoverished knowledge base will make that integrative process relatively slow. Thus, children’s early ignorance may often save them from misplaced credulity.Author Keywords: Trust; Testimony; Sources ; Cognitive development; Situation model. (shrink)

This paper attempts to investigate five and six-year old children’s ability to formulate logical reasoning. More specifically, our interest focuses on the investigation of young children’s ability to use arguments based on logical reasoning. Can pre-school children build arguments based on logical reasoning such as deductive reasoning, or forms of indirect reasoning? Can teaching contribute to the development of you children’s ability to manipulate logical reasoning in the forms previously mentioned? These are the basic questions we attempt to answer in (...) this paper. Thirteen pre-school children participated in the study. The children were involved in organized dialogues in order to investigate their ability to build logical argumentation. Our findings showed that the children had the ability to use arguments with structures, resembling reasoning found in formal logic such as deductive reasoning, inductive reasoning, as well as reasoning based on the law of excluded middle. (shrink)