posit distinct connection across individual cortical layers (e.g., predictive coding (Stephan et al. 2019), hierarchical processing streams) may now be directly tested in humans. This will allow a large field of researchers to investigate mechanisms behind any number of neuropsychological and psychiatric phenomena, such as selective attention, impulse control, learning, adaptation, hallucinations, cognitive control, conscious perception (Schneider et al. 2019), and multi-sensory integration (Lawrence et al. 2019), to name a few.
