Place, U. T. (1990-09-24). Two concepts of consciousness: the biological/private and the linguistic/social. Slovenian Philosophical Society, Faculty of Philosophy, University of Ljubljana, 24 September 1990
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Place, U. T. (1991-02-20b). Two concepts of consciousness: the biological/private and the linguistic/social. Footsteps of the Brain in the Syntax of Natural Language. Three-day Conference assembled to discuss five papers presented by Dr. U. T. Place. Neurosciences Institute, New York, 19th-21st February 1991.
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Place, U. T. (1991-02-25). Two concepts of consciousness: the biological/private and the linguistic/social. Department of Psychology, Temple University, Philadelphia, Pennsylvania, 25 February 1991.
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Place, U. T. (1991-03-08). Two concepts of consciousness: the biological/private and the linguistic/social. Department of Philosophy and Business Ethics, Bentley College, Waltham, Massachusetts, 8 March 1991.
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Place, U. T. (1991-03-18). Two concepts of consciousness: the biological/private and the linguistic/social. The Psychology and Linguistic Sections of the New York Academy of Sciences, 18 March 1991
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Place, U. T. (1991-03-29). Two concepts of consciousness: the biological/private and the linguistic/social. Annual Meeting of the Southern Society for Philosophy and Psychology, Atlanta, Georgia, 29 March 1991.
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Place, U. T. (1991-11-22). Two concepts of consciousness: the biological/private and the linguistic/social. Philosophy Society, University of Sussex, 22 November 1991.
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Place, U. T. (1992-04-14). Two concepts of consciousness: the biological/private and the linguistic/social. Annual Conference of the History and Philosophy of Psychology Section of the British Psychological Society, Bishop Grosseteste College, Lincoln, 14 April 1992.
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Place, U. T. (1992-07-09). Two concepts of consciousness: the biological/private and the linguistic/social. Research group on 'Biological Bases of Human Culture', Zentrum für interdisziplinäre Forschung, Universität Bielefeld, 9 July 1992.
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Place, U. T. (1993-10-22). Two concepts of consciousness: the biological/private and the linguistic/social. Seminar, Department of Psychology, University of St. Andrew's, 22 October 1993.
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