Ontological and methodological constraints on a theory of cognition that would generalize across species are identified. Within these constraints, ecological arguments for animal-environment mutuality and reciprocity and the necessary specificity of structured energy distributions to environmental facts are developed as counterpoints to the classical doctrines of animal-environment dualism and intractable nonspecificity. Implications of and for a cognitive theory consistent with Gibson's programme of ecological psychology are identified and contrasted with contemporary cognitivism.

A unifying theory of general anesthetic-induced unconsciousness must explain the common mechanism through which various anesthetic agents produce unconsciousness. Functional-brain-imaging data obtained from 11 volunteers during general anesthesia showed specific suppression of regional thalamic and midbrain reticular formation activity across two different commonly used volatile agents. These findings are discussed in relation to findings from sleep neurophysiology and the implications of this work for consciousness research. It is hypothesized that the essential common neurophysiologic mechanism underlying anesthetic-induced unconsciousness is, as with (...) sleep-induced unconsciousness, a hyperpolarization block of thalamocortical neurons. A model of anesthetic-induced unconsciousness is introduced to explain how the plethora of effects anesthetics have on cellular functioning ultimately all converge on a single neuroanatomic/neurophysiologic system, thus providing for a unitary physiologic theory of narcosis related to consciousness. (shrink)

Este artículo pasa revista a las principales contribuciones de Víctor Sánchez de Zavala a la lingüística y a la filosofía, a traves del análisis de las ideas centrales de su pensamiento expuestas en sus libros y artículos. Despues de una breve introdueción a su biografía académica, se analiza y explica el papel esencial que Víctor Sánchez de Zavala tuvo en la introducción de la gramatíca generativa en España. Se examina en este sentido su trabajo corno profesor, editor, traductor y escritor (...) y la Iínea central de su trabajo lingüístico. La segunda parte del artículo analiza las hipótesis fundamentales de la teoda pragmática desarrollada por este filósofo y lingüísta a lo largo de toda su vida. En esta sección, por otra parte, se presenta y discute su novedoso enfoque global de la actividad lingüística expuesta en su obra póstuma, de reciente aparieión: Hacia la pragmática (psicoIógica), Madrid, Visor.This paper reviews Víctor Sánehez de Zavala’s main contributions to linguistics and philosophy through a close look at the central ideas developed in his articles and books. In the first part, after a brief introduction to his academic biography, the leading role of Víctor Sánchez de Zavada in the introduction of formal linguistics in Spain is analysed and justified. His work as editor, professor, translator and writer is examined through his main publications. The second part of the paper is devoted to provide an analysis of the central hypotheses on which this theory of psychologicaI pragmatics is based. Furthermore, this second part examines his novel and global approach to linguistic activity, developed in his posthumous book Towards a psychological pragmatics. (shrink)