The existence of personal identity has its foundation in a state of consciousness. The Cartesian man can
thus be seen as a reflecting man, not as an acting man (cf. Marková, 1982). Reflection is thus prior to action
in the sense that to be sure of our existence we must be conscious of our acts. As Marková (1982) puts it, to
say that “I walk, therefore I exist” must refer to the awareness of doing this. More precisely one should say:
“I
am aware that I walk, therefore I exist”.
George Berkeley (1685–1753) again advanced one step from Locke’s position; not only were the
secondary qualities constructed by the mind as Locke had argued, but also primary qualities (extension,
shape, etc.). His position is condensed in the new principle, “Esse est percipi”, according to which the
objects of experience only exist as being experienced. This position is usually called epistemological or
subjective idealism (Hamlyn, 1967, p. 25). Berkeley’s position should not be misunderstood—he did not
argue that the outer world does not exist. What he asserts is that unexperienced reality does not make sense
(Marc-Wogau, 1983, p. 219). Consequently, objects not experienced
by individuals exist anyway, as they
are experienced by a God.
Like Berkeley, David Hume (1711–1776) argued that man in direct experience is aware only of his ideas.
Thus, Hume denies the causal role of primary qualities accepted by Locke. As ideas were the only objects
of certain knowledge, the existence of external objects, causal relations etc. had to be inferred from
perceptual evidence. The associative rules guaranteed the coherence of perception.
Rationalists (e.g. Descartes) argued that absolutely certain knowledge is possible only in conceptual
domains like logic and mathematics, which are not dependent on empirical reality. The
empiricists thought
that sources of knowledge consist in our experience, and true knowledge of the outer reality should thus be
possible (Uljens, 1994b, pp. 40 ff.). The empiricists (Hume), however, did not succeed in reaching true
knowledge of the world because they were trapped in the sceptical tradition and made a distinction between
the world as such and the world as perceived. The empiricist conclusion was thus extremely close to
Descartes’ position; only propositions about the world as perceived were possible.
The difference between Locke’s and Hume’s empiricism is crucial in this context. Whereas Locke
preserved the idea of a causal theory of perception concerning primary qualities, Hume did not accept this
position. Therefore it appears that present-day cognitivism is closer to Lockean than to Humean empiricism
as a causal theory of perception is accepted. While Locke accepted that the mechanism
by which simple
ideas were combined into complex ideas was an innate capacity to unite, compare and repeat ideas,
contemporary cognitivism is often silent about what is innate, although the question is debated. Cognitivism
rather emphasizes the individual’s capacity to construct new methods of connecting simple ideas with each
other.
The Kantian Impact
Finally there is reason to briefly consider the Kantian solution, which in a
certain sense combined the
rationalistic and empiricist traditions. In accordance with the empiricists, Kant (1724–1804) thought that
knowledge of empirical reality must be possible. Further he thought, like the empiricists, that the only
reality we have access to is the experienced,
phenomenal, reality. The reality-as-such is impossible to reach
in direct experience but nevertheless exists. In order to avoid the risk of solipsism or idealism in both
rationalism and empiricism he locked the mind by introducing aprioristic categories and relational concepts
which organize sense impressions. The forms of perception
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