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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 neuroimaging, 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.