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Word Association Experiments

Word Association Experiments

The Word Association Experiments were the empirical procedure through which Jung, between 1902 and 1909 at the Burghölzli clinic in Zurich, established the existence of the feeling-toned complex as a demonstrable psychological fact. Building on the reaction-time methodology inherited from Wundt, Galton, Ziehen, and Aschaffenburg, Jung presented subjects with a standardized list of stimulus-words and measured the interval before each response, together with the content of the reply and its fidelity when reproduced later.

Jung’s innovation was interpretive. Where his predecessors had treated the outlying data — the delays, the unusual responses, the reproduction failures — as experimental noise, Jung read them as signal. “In the figures given, it follows that relatively long reaction-times are almost without exception caused by the intervention of a strong feeling-tone” (Jung, CW 2 §621). Analysis of the clusters revealed a unifying affective theme — a broken engagement, a money worry, a hidden grief — that the subject had not intended to disclose and often had not been consciously aware of. “The constellating complex here plays the part of a quasi-independent entity — a ‘second consciousness’.”

The experiment became the foundation for the broader diagnostic and therapeutic program. As Jung later summarized: “it was from these researches that the diagnostic association experiment was developed, an experiment which furnishes us with a quick and certain clue to the most important of the complexes” (Jung, CW 18 §962). In hysteria, the complex showed itself with special force: “the associations are often so much under the influence of a feeling-toned complex that the other parts of the personality hardly show up at all” (CW 2 §909). The laboratory had produced what clinical intuition had long suggested — that autonomous psychic contents operate beneath the ego’s awareness and steer its expression.

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