Neurofeedback of slow cortical potentials: neural mechanisms and feasibility of a placebo-controlled design in healthy adults.

There was further a marginal trend for an interaction “Block × Training” ( F (2, 34) = 2.2, ɛ = 0.78, p = 0.12, part η 2 = 0.11), but post hoc tests revealed no clear differences in time-on-task effects across training groups.

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