Keppel Hesselink, J. M. (2025a). From flickers to formless: Mapping phosphene trajectories in Tibetan Dzogchen, Christian mysticism, and contemporary meditation. PsyArXiv Preprints. https://osf.io/preprints/psyarxiv/hfv…

Keppel Hesselink, J. M. (2025b). The ultrasubjective hyperspace: A unified model of consciousness and reality. PsyArXiv Preprints. https://osf.io/preprints/psyarxiv/bh7…

Keppel Hesselink, J. M. (2025c). From point to eternity: A hierarchical taxonomy and phenomenology of meditation-induced phosphenes and luminous light experiences. PsyArXiv Preprints. https://osf.io/preprints/psyarxiv/cv7…

Keppel Hesselink, J. M. (2025d). Inner light, inner seeing: A phenomenological inquiry into phosphene meditation and the structure of mystical perception. PsyArXiv Preprints. https://osf.io/preprints/psyarxiv/s56…