Concentrative (Sahaj Samadhi) meditation training and visual awareness: An fMRI study on color afterimages.
Progress in Brain Research January 1, 2019 Amrendra Singh, V. S. Chandrasekhar Pammi, A. Guleria et al.
Long-term concentrative meditation practice alters visual awareness by strengthening attentional control. Using negative color afterimages in a functional MRI study, activity increased in right inferior occipital and inferior frontal cortex, suggesting these brain regions are key to how attention modulates conscious visual experience. The findings indicate that meditation may change the link between attention and conscious experience.