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Single Idea 21583

[filed under theme 12. Knowledge Sources / B. Perception / 4. Sense Data / c. Unperceived sense-data ]

Full Idea

In all cases of sense-data capable of gradual change, we may find one sense-datum indistinguishable from another, and that indistinguishable from a third, while yet the first and third are quite easily distinguishable.

Gist of Idea

When sense-data change, there must be indistinguishable sense-data in the process

Source

Bertrand Russell (Our Knowledge of the External World [1914], 5)

Book Ref

Russell,Bertrand: 'Our Knowledge of the External World' [Routledge 1993], p.148


A Reaction

This point is key to the sense-data theory, because it gives them independent existence, standing between reality and subjective experience. It is also the reason why they look increasingly implausible, if they may not be experienced.


The 4 ideas with the same theme [the status of sense-data when not perceived]:

When sense-data change, there must be indistinguishable sense-data in the process [Russell]
We do not know whether sense-data exist as objects when they are not data [Russell]
'Sensibilia' are identical to sense-data, without actually being data for any mind [Russell]
Ungiven sense-data can no more exist than unmarried husbands [Russell]