Brain activation patterns in response to complex triggers in the Word Association Test: results from a new study in the United States

C.G. Jung's theory of psychological complexes lies at the root of analytical psychology theory and practice. Functional magnetic resonance imaging (fMRI) provides a powerful tool to validate the theory of complexes and eludicate the neuropsychologic mechanisms underlying the unconscious activation of significant memories. In this study, using fMRI, we identify two brain circuits which are activated in response to complex triggering words. Circuit one involves brain regions involved in episodic memory and somatic (body) responses and the experience of uncertainty. A second circuit involves episodic memory, emotion, visual and language association, and semiotic meaning. Specific brain regions include the right prefrontal cortex, SMA cortex, left temporal cortex, and the caudate and cingulate. These brain circuits may be thought of as the biological form in which complexes are experienced. Implications for analytic psychology practice and theory are discussed.     

Les bases neurales de la perception du temps et de la régulation temporelle de l'action

Adaptation to environment requires that temporal characteristics of events and actions are taken into account. The neural bases of temporal encoding and memory mechanisms raise core questions. Interesting information is provided by the recording of slow brain potential changes, thanks to the excellent temporal resolution of this method. The recording of metabolic activity changes enables identification of several cortical and subcortical structures which subtend temporal mechanisms. Current data enlighten the involvement of the basal ganglia and the frontal cortex (in particular the supplementary motor area) in time processing.     

A dynamic systems approach to the feeling toned complex

A review of Jung’s writing on the ‘feeling‐toned complex’ shows that he considered it to comprise independent, split‐off, psychic elements. Modern advances in scientific thinking and technology, namely Dynamic Systems Theory and neuro‐imaging, allow us to better define and explore this psychic phenomenon. Considering the constellation of the complex as a hierarchy of dynamic systems allows for a prediction of the timing of brain activity. This has been confirmed by two independent studies using fMRI and QEEG while administering the Word Association Experiment, the tool Jung used to investigate brain/psychic functioning over a century ago. Using as a framework the stages of the constellation of a complex viewed as a hierarchy of dynamic systems, I review the neuro‐imaging studies reported by Petchkovsky et al. (2013, 2017) and Escamilla et al. (2018), concluding that quantitative theoretical predictions and experimental results are in agreement within an order of magnitude. The change in attention caused by the constellation of the complex can also be conceived as the switching from a default neuro‐network, a startle response activating executive functioning in the frontal cortex of either the ego‐complex or an autonomous complex.