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A subject is a being who has a unique consciousness and/or unique personal experiences, or an entity that has a relationship with another entity that exists outside of itself (called an "object"). A subject is an observer and an object is a thing observed. This concept is especially important in continental philosophy, where 'the Subject' is a central term in debates over human autonomy and the nature of the self.
The sharp distinction between subject and object corresponds to the distinction, in the philosophy of René Descartes, between thought and extension. Descartes believed that thought (subjectivity) was the essence of the mind, and that extension (the occupation of space) was the essence of matter.
In the modern continental tradition, which may plausibly be said to date from Descartes , debates over the nature of the Subject play a role comparable to debates over personhood within the distinct Anglo-American tradition of analytical philosophy.
The subject in German idealism
Subject as a key-term in thinking about human consciousness began its career with the German Idealists, in response to David Hume's radical skepticism. The idealists' starting point was Hume's conclusion that there is nothing to the self over and above a big, fleeting bundle of perceptions. The next step was to ask how this undifferentiated bundle comes to be experienced as a unity – as a single subject. Hume had offered the following proposal:
- "...the imagination must by long custom acquire the same method of thinking, and run along the parts of space and time in conceiving its objects.
Kant, Hegel and their successors sought to flesh out the process by which the subject is constituted out of the flow of sense impressions. Hegel, for example, stated in his Preface to the Phenomenology of Spirit that a subject is constituted by "the process of reflectively mediating itself with itself."
Hegel begins his definition of the subject at a standpoint derived from Aristotelian physics: "the unmoved which is also self-moving" (Preface, pgph. 22). That is, what is not moved by an outside force, but which propels itself, has a prima facie case for subjectivity. Hegel's next step, however, is to identify this power to move, this unrest that is the subject, as pure negativity. Subjective self-motion, for Hegel, comes not from any pure or simple kernel of authentic individuality, but rather, it is
- "...the bifurcation of the simple; it is the doubling which sets up opposition, and then again the negation of this indifferent diversity and of its anti-thesis" (Preface, pgph. 18).
The Hegelian subject's modus operandi is therefore cutting, splitting and introducing distinctions by injecting negation into the flow of sense-perceptions. Subjectivity is thus a kind of structural effect – what happens when Nature is diffused, refracted around a field of negativity and the "unity of the subject" for Hegel, is in fact a second-order effect, a "negation of negation". The subject experiences itself as a unity only by purposively negating the very diversity it itself had produced. The Hegelian subject may therefore be characterized either as "self-restoring sameness" or else as "reflection in otherness within itself" (ibid.) In short, a subject in the Hegelian sense is subjected to subjection.
The thinking of Marx and Freud provided a point of departure for questioning the notion of a unitary, autonomous Subject, which for many thinkers in the Continental tradition is seen as the foundation of the liberal theory of the social contract. These thinkers opened up the way for the deconstruction of the subject as a core-concept of metaphysics.
Jacques Lacan, inspired by Heidegger and Saussure, built on Freud's psychoanalytic model of the subject, in which the "split subject" is constituted by a double bind: alienated from jouissance when he or she leaves the Real, enters into the Imaginary (during the mirror stage), and separates from the Other when he or she comes into the realm of language, difference, and demand in the Symbolic or the Name of the Father.
Thinkers such as Althusser, Foucault, or Bourdieu theorize the subject as a social construction. According to Althusser, the "subject" is an ideological construction (more exactly, constructed by the "Ideological State Apparatuses"). One's subjectivity exists, "always already" and is discovered through the process of interpellation. Ideology inaugurates one into being a subject, and every ideology is intended to maintain and glorify its idealized subject, as well as the metaphysical category of the subject itself.
According to Foucault, it is the "effect" of power and "disciplines" (See Discipline and Punish: construction of the subject as student, soldier, "criminal", etc.). Foucault believed it was possible to transform oneself, he used the word ethopoiein from the word ethos to describe the process.
Subjectivity in analytic philosophy
In contemporary analytic philosophy, the issue of subject—and more specifically the "point of view" of the subject, or "subjectivity"—has received attention as one of the major intractable problems in philosophy of mind (a related issue being the mind-body problem). In the essay What is it like to be a bat?, Thomas Nagel famously argued that explaining subjective experience—the "what it is like" to be something—is currently beyond the reach of scientific inquiry, because scientific understanding by definition requires an objective perspective, which, according to Nagel, is diametrically opposed to the subjective first-person point of view. These additional features of subjective experience are often referred to as qualia (see Frank Cameron Jackson and Mary's room).
- Louis Althusser's conception of Ideological State Apparatuses (I.S.A.) and interpellation of the subject
- Cognitive linguistics
- Donald Davidson's swamp man thought experiment (in "Knowing One Own's Mind", 1987 paper)
- Michel Foucault's critique of the subject and the oxymoron "Historical subject"
- List of ethics topics
- Moral relativism
- Subjective experience
- Subject-object problem
- Personhood theory
- Transsubjectivation (Michel Foucault)
- Heartfield, James (2002). "Postmodernism and the 'Death of the Subject'". The Death of the Subject. Retrieved 28 March 2013.
- Foucault, Michel (2006). The hermeneutics of the subject : lectures at the Collège de France, 1981-1982. New York: Picador. p. 237. ISBN 9780312425708.
- Alain de Libera, "When Did the Modern Subject Emerge?", American Catholic Philosophical Quarterly, Vol. 82, No. 2, 2008, pp. 181-220.
- Robert B. Pippin, The Persistence of Subjectivity. On the Kantian Aftermath, Camabridge: Cambridge University Press, 2005.
- Udo Thiel, The Early Modern Subject. Self-Consciousness and Personal Identity from Descartes to Hume, New York: Oxford University Press, 2011.