Reaction time occupies a foundational position in Jung's experimental depth psychology, serving as the primary quantitative instrument through which the presence, intensity, and topography of emotionally charged complexes are mapped. Across the Experimental Researches corpus, reaction time is never treated as a mere chronometric datum; it is consistently interpreted as a psychodynamic index — a temporal signature of unconscious interference. Jung establishes that prolonged reaction times, those exceeding the probable mean for a given subject, mark the sites where a feeling-toned complex has disrupted the smooth flow of associative response. The instrument — a one-fifth-second stopwatch — is deliberately modest, yet its yield is theoretically rich: differential times across stimulus-words reveal gender differences (male subjects faster than female), educational gradients (educated subjects faster than uneducated), and grammatical-categorical effects (abstract nouns generating the longest latencies, concrete nouns the shortest among most groups, with educated men as a telling exception). Beyond statistical averages, reaction time functions diagnostically — in criminal investigation, differential psychiatric diagnosis, and psychoanalytic exploration — and in tandem with galvanometric and pneumographic measures, it triangulates the somatic signature of the complex. The core theoretical claim is that extended reaction time reveals how long the psyche requires to detach itself from a conscious or unconscious preoccupation and attend to the new stimulus, making it one of depth psychology's most precise experimental windows onto the unconscious.
The average reaction-time came out at 1.8 seconds. The times of male subjects (1.6 seconds) are on average shorter than those of female subjects (2.9 seconds). The quality of the stimulus-word exerts a certain influence on the reaction-time.
This passage provides the foundational empirical summary of reaction-time norms, establishing baseline averages and the systematic influences of gender, education, and stimulus-word category on response latency.
, Experimental Researches, 1904thesis
Lengthened reaction-time may therefore be regarded as a complex indicator, and be employed for the selection from a series of associations of such as have a personal significance to the individual.
This passage establishes the decisive theoretical claim that prolonged reaction time is a reliable indicator of a personally significant, emotionally charged complex, whether or not the subject is consciously aware of it.
, Experimental Researches, 1904thesis
The reaction-time shows how long the mind requires to detach itself from its conscious or unconscious preoccupation, and turn to the new stimulus.
This passage offers Jung's most concise theoretical definition of what reaction time actually measures psychologically: the duration of psychic adhesion to a complex before the subject can redirect attention.
, Experimental Researches, 1904thesis
Very long reaction-times nearly always occur in quite definite places... The stimulus-words water, ship, lake, and to swim stimulated this complex. During the short interval between stimulus-word and reaction something unpleasant (the complex) had crossed the subject's mind.
This passage demonstrates concretely how clustered prolonged reaction times expose a latent traumatic complex — here suicidal ideation by drowning — through the pattern of stimulus-word associations.
, Experimental Researches, 1904thesis
The time-differences can frequently be as much as twenty or thirty seconds without there being at first any indication of the reason... the internal associations, particularly reactions to abstract stimulus-words, on the whole require a longer time than the external associations.
This passage distinguishes between the modest chronometric differences attributable to association type and the dramatically extended latencies produced by complex-activation, establishing the diagnostic salience of extreme outliers.
, Experimental Researches, 1904thesis
Between the stimulus-word and the reaction (the 'reaction-time')... She has, with relatively short times overall, four unusually long times, ranging from 3.4 to 5.0 seconds.
This passage introduces the clinical procedure of the association experiment and illustrates via a tabulated case how reaction times are recorded and how anomalously long latencies signal complex interference.
, Experimental Researches, 1904thesis
Abstract terms produce the longest intervals (1.95 and 1.98 seconds); if the reaction-word is a concrete one a longer time is taken than that produced by a concrete stimulus-word.
This passage details how the semantic quality of both stimulus-word and reaction-word independently modulates reaction time, with abstract content consistently producing longer latencies.
, Experimental Researches, 1904supporting
Emotions, especially feelings of unpleasure, are expressed in abnormally long reaction-times... The arithmetical mean time of all correctly repeated reactions is 3.0 seconds. The mean of those not repeated is 5.0 seconds.
This passage correlates prolonged reaction times with affective unpleasure and demonstrates that associations with the longest latencies are also the most susceptible to failures of reproduction, linking reaction time to complex repression.
, Experimental Researches, 1904supporting
Series I. Probable average of reaction-times in associations with unusually high galvanometer curves 2.2 sec. Series I. Arithmetical average of the corresponding galvanometer curves 5.2 mm.
This passage quantitatively co-registers reaction times and galvanometric deflections, showing that associations with elevated physiological arousal also tend toward longer reaction latencies, validating both measures as complex indicators.
, Experimental Researches, 1904supporting
Everyone of the incorrect reactions has a reaction-time not only higher than that of the preceding reaction but prolonged beyond the average of the others. Two of the incorrect associations follow emotionally charged reactions.
This passage links faulty associative constructions to elevated reaction times, arguing that abnormal latency marks the intrusion of an emotional complex rather than mere cognitive deficit.
, Experimental Researches, 1904supporting
Out of 200 stimulus-words, 48 aroused prolonged reaction-times in 5 or more out of 11 subjects. 17 stimulus-words produced prolonged reaction-times in 5 subjects. Of these 76% referred to emotionally charged content.
This passage provides quantitative epidemiology of stimulus-words that reliably elicit prolonged latencies across multiple subjects, establishing that emotional resonance rather than linguistic difficulty is the primary determinant.
, Experimental Researches, 1904supporting
The probable mean for concrete nouns is 1.67 secs., for general concepts 1.95 secs., adjectives 1.70 secs., verbs 1.90 secs.
This passage supplies the canonical reference table of reaction-time norms by grammatical-semantic category that underpins the diagnostic use of latency deviations in evidence diagnosis.
, Experimental Researches, 1904supporting
The disturbance begins with a reaction that is shorter than that of the immediately preceding correctly reproduced association... those complicated by 'mistakes' were excluded from the calculation.
This passage examines the sequence structure of reaction times around reproduction disturbances, finding that the onset of complex interference is preceded by an anomalous brevity before the prolonged latency emerges.
, Experimental Researches, 1904supporting
The probable mean reaction-times in this case, in which the subject belongs to the educated class, is 2.0 seconds. Excessively long reaction-times therefore are those above 2.0.
This passage establishes the methodological principle that complex-indicative reaction times must be defined relative to an individual subject's probable mean rather than population norms.
, Experimental Researches, 1904supporting
Measurement with a 1/5-second stop-watch not only appears entirely satisfactory, but has been proved adequate by several other writers in numerous experiments.
This passage defends the methodological adequacy of the stopwatch for reaction-time measurement in association experiments, positioning the instrument against more complex apparatus and validating its use with both normal and psychotic subjects.
, Experimental Researches, 1904supporting
Abnormally long reaction-times frequently occur in the complex-reactions; unfortunately, however, no systematic measurements were taken with this subject.
This passage notes the occurrence of prolonged reaction times in complex-associated responses while acknowledging the evidentiary limitation of unsystematic measurement, underscoring the methodological importance of consistent timing.
, Experimental Researches, 1904supporting
Reaction-time longer than the average (measured with a stop-watch)... complex-characteristics thus served the purpose of ascertaining emotionally charged content.
This passage situates prolonged reaction time within a broader taxonomy of complex-characteristics alongside repetition, mishearing, expressive movements, and perseveration, establishing its role in a multi-indicator diagnostic scheme.
, Experimental Researches, 1904supporting
The incorrectly reproduced associations occasionally have an arithmetical time-mean that exceeds the general arithmetical mean... I then stressed one feature in particular, repression (Freud), because precisely this feature seemed to me best to explain the inhibition of the correct reproduction.
This passage connects elevated mean reaction times in incorrectly reproduced associations to Freudian repression, theorizing that the complex's resistance to conscious reproduction is the same force that prolongs initial response latency.
, Experimental Researches, 1904supporting
The extension of the reaction-time usual in similar situations failed to occur... a preceding emotionally charged association can leave a trace in the unconscious and unconsciously constellate the reaction.
This passage documents an instance where an expected reaction-time prolongation does not occur because the emotional charge of a preceding association was insufficiently intense, illustrating the contingent sensitivity of the measure.
, Experimental Researches, 1904supporting
The long reaction-times may be due to this affected manner of expression, though this can hardly be the only cause... Only the reaction-time here is what we expect.
This clinical case passage notes that affectation of expression can contribute to prolonged latency in ways that complicate purely complexometric interpretation, introducing a confound requiring differential analysis.
, Experimental Researches, 1904supporting
A reduction in the average height of the galvanometer curve, which is clearly due to lessening of the power of the stimulus in the repetition. The same phenomenon is also seen in the average of the reaction-times, which is shortened.
This passage demonstrates that habituation across repeated series produces parallel reductions in both galvanometric deflection and reaction-time duration, linking the two physiological-behavioral indices through a common mechanism of decreasing emotional activation.
, Experimental Researches, 1904supporting
Semantic relationships (causing delay) occur... internal associations, while purely linguistic associations are very much less prominent. According to Ziehen's observations on children, associations by means of internal connections are distinguished by the longer reaction-times.
This passage reviews the debate between Ziehen and Aschaffenburg on whether semantic versus linguistic association types are differentially marked by reaction-time duration, situating Jung's work within the empirical controversy.
, Experimental Researches, 1904aside
Medication reduced target and foil reaction times, in each case improving performance following medication. Task load × medication interaction tests showed there was a significant effect only for target reaction time.
This passage reports pharmacological modulation of reaction time in ADHD research, tangentially relevant as a contemporary neuroscientific context in which reaction time continues to serve as a performance metric.
, The Effects of Stimulant Medication on Working Memory Functional Connectivity in Attention-Deficit/Hyperactivity Disorderaside