Extended Self

Definition

The extended self is the proposition that a person's self is not bounded by their skin — that possessions, tools, records, places and other people are, under some descriptions, genuinely parts of the self rather than merely things the self owns or uses.

Two largely separate literatures use the term, discussed below:

Consumer-Research

Russell Belk's "Possessions and the Extended Self" (Journal of Consumer Research, 1988) is the founding paper in this tradition. Belk's argument, building on William James's remark that a person's self is "the sum total of all that he CAN call his," is that people incorporate objects into their sense of identity, and that the evidence is behavioural rather than introspective: the grief reported after burglary or fire, which regularly exceeds the material loss; the difficulty of disposing of objects with no use and no value; the way gifts, heirlooms and collections function.

Belk revisited the argument in "Extended Self in a Digital World" (2013), noting that dematerialisation changes the picture: digital possessions are shared rather than exclusive, co-constructed with others, and stored somewhere the owner does not control.

Philosophy-of-Mind

Andy Clark and David Chalmers's "The Extended Mind" (Analysis, 1998) makes a stronger and more contested claim. Their thought experiment concerns Otto, who has Alzheimer's and writes addresses in a notebook he always carries, and Inga, who remembers them. When each wants to go to the museum, Otto consults the notebook and Inga consults her memory. Clark and Chalmers argue there is no principled reason to count Inga's belief as part of her mind and Otto's as external, provided the notebook is reliably available, readily accessible, automatically endorsed and previously consciously endorsed — their parity principle.

Clark develops this into a general position in Natural-Born Cyborgs (2003): humans are distinguished not by raw cognitive power but by an unusual readiness to incorporate external structure into their thinking, which makes literacy, notation, and the smartphone continuous with each other.

The standard objection, from Adams and Aizawa among others, is the "coupling–constitution fallacy": that a process being causally coupled to cognition does not make it cognition.

The phone is where the two literatures converge on a single object. It holds memory that is not in the head, identity documents, relationships, purchase history and location record; it is defended like a body part, and its loss produces distress out of proportion to its price. Belk's framework explains the attachment; Clark's explains the functional dependence.

Relevance to Cyborg Anthropology

The extended self is the philosophical statement of the cyborg premise, arrived at without the vocabulary of hardware. If the parity principle holds, the boundary of the person is a question about functional integration rather than about skin — which is exactly the claim this field makes, and which most law, ethics and design still decline to accept.

Related Reading

• Natural-Born Cyborgs: Minds, Technologies, and the Future of Human Intelligence
• Cyborg
• Prosthetics and Their Discontents
• Thorstein Veblen
• Persistent Paleontology
• Quantified Self