The term 'measurement' occupies a distinctly contested position in the depth-psychology corpus, cutting across epistemological, clinical, and philosophical registers. Three broad positions can be identified. First, within early experimental psychology, Jung's galvanometric and reaction-time studies treat measurement as a legitimate, if necessarily approximate, instrument for detecting the presence and intensity of emotionally charged complexes — a methodological faith in quantification tempered by awareness of its inherent incompleteness. Second, Jung's theoretical writings on psychic energy establish a principled tension: exact measurement of psychic quantities is structurally unavailable to psychology, which must substitute the valuation function of feeling for the concrete measurement available to physics. This epistemological gap is not merely practical but constitutive. Third, from a philosophical direction, Nussbaum's reading of Plato's Protagoras and Seaford's analysis of Greek monetary thought expose measurement as a deeply normative project — the ancient 'techne of measurement' proposed by Socrates represents nothing less than an ethical science of commensurability, promising salvation from the tyranny of competing appearances. Pauli's quantum-mechanical reflections add a further layer: the act of measurement disturbs the system measured, rendering full determinacy impossible. Across these voices, measurement appears simultaneously as psychology's aspiration, its limitation, and, in the Platonic-monetary tradition, as a cultural fantasy of mastery over the irreducible plurality of value.
In the library
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exact measurement of quantities is replaced by an approximate determination of intensities, for which purpose, in strictest contrast to physics, we enlist the function of feeling (valuation). The latter takes the place, in psychology, of concrete measurement in physics.
Jung argues that psychology cannot achieve the exact quantitative measurement of physics, substituting instead the feeling-function as its structural analogue for gauging psychic intensity.
Jung, Carl Gustav, The Structure and Dynamics of the Psyche, 1960thesis
Socrates claims to have enabled us to see our deep and pressing need for an ethical science of measurement… Argument about whether, in fact, our values are commensurable on a single scale is, then, replaced by argument to the conclusion that they must be.
Nussbaum shows that Socrates transforms the question of value commensurability into a pragmatic necessity, asserting that the 'techne of measurement' is indispensable to ethical life and psychic stability.
Martha C. Nussbaum, The Fragility of Goodness: Luck and Ethics in Greek Tragedy and Philosophy, 1986thesis
What measure is there of the relations of pleasure to pain other than excess and defect, which means that they become greater and smaller, and more and fewer, and differ in degree? … There can be no other measure of them.
Plato's Socrates proposes that pleasure and pain are exclusively measurable by quantitative excess and deficiency, establishing measurement as the sole rational instrument for ethical choice.
Aristotle states that currency (nomisma) measures all things (panta . . . metrei)… 'Humankind is the metron of all chrāemata' means that we measure or limit all things, thereby establishing their identity and so in a sense their existence.
Seaford demonstrates that in early Greek thought measurement by monetary metron constitutes the very identity and existence of things, drawing a structural parallel between monetary valuation and cosmological ordering.
Seaford, Richard, Money and the Early Greek Mind: Homer, Philosophy, Tragedy, 2004thesis
Metron does not inhere in things, but is imposed by human noēsis. This interpretation solves several problems… It is only by virtue of our thought (or action) that things have metra.
Seaford argues that Protagoras' doctrine relocates the measure of all things from an intrinsic property of objects to an imposition of human cognition, anticipating constructivist epistemology.
Seaford, Richard, Money and the Early Greek Mind: Homer, Philosophy, Tragedy, 2004supporting
the interactions of the measuring instruments with the system observed remain partially indeterminable whenever the finiteness of… quantum mechanics… [obtains]
Pauli invokes the quantum-mechanical limitation on measurement to draw an analogy between the indeterminacy introduced by observational instruments in physics and the autonomy of the unconscious in psychology.
Pauli, Wolfgang, Writings on Physics and Philosophy, 1994supporting
measurement with a 1/5-second stop-watch… has been proved adequate by several other writers in numerous experiments… in the case of psychotics exact measurements are impossible.
Jung's early experimental work distinguishes between the adequacy of chronometric measurement in normal subjects and its fundamental impossibility with psychotic patients, marking a practical limit of quantification in psychopathology.
Jung, C. G., Experimental Researches, 1904supporting
Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues
Nijenhuis positions measurement as a central pillar of somatoform dissociation research, linking empirical instrumentation to the theoretical elaboration of dissociative phenomena.
Nijenhuis, Ellert, Somatoform Dissociation: Phenomena, Measurement, and Theoretical Issues, 2004supporting
Assessment and measurement of spirituality and religiousness, together with the various domains or attributes associated with both constructs, are indispensable elements of research in the AOD field.
Benda treats the reliable measurement of spirituality and religiousness as a methodological prerequisite for credible research on substance-use recovery, emphasizing instrumentation and domain specification.
Benda, Brent B., Spirituality and Religiousness and Alcohol/Other Drug Problems: Treatment and Recovery Perspectives, 2006supporting
we have estimated the space of latent time in a number of normal cases by measuring the distance of the curve from the moment of stimulation to the beginning of ascent of the emotional curve, taking the measurements in millimetres.
Jung describes the physical measurement of latent time on the kymograph as a proxy for detecting the onset of emotional arousal, illustrating the methodological ingenuity and limitations of psychophysical quantification.
Jung, C. G., Experimental Researches, 1904supporting
The immediate experience of quantitative psychic relations on the one hand, and the unfathomable nature of a psychophysical connection on the other, justify at least a provisional view of the psyche as a relatively closed system.
Jung invokes the partial accessibility of quantitative psychic relations to argue for treating the psyche as a provisionally closed energic system, acknowledging the limits of measurement without abandoning the quantitative framework.
Jung, Carl Gustav, The Structure and Dynamics of the Psyche, 1960aside
in order to decide, by means of such a recoil measurement, whether the light quantum has gone through the aperture L or not… the uncertainty relation would once again make adequate knowledge of its momentum and of its position… mutually exclusive.
Pauli illustrates through a quantum optics example how measurement itself generates irreducible epistemic constraints, a principle he elsewhere extends to the psychophysical problem.
Pauli, Wolfgang, Writings on Physics and Philosophy, 1994aside