The God Helmet became one of the most publicly cited findings in the science of religious experience, popularized well beyond the neuroscience literature and often presented, in press coverage, as having explained mystical experience outright. That popular framing ran ahead of what Persinger's own papers claimed and well ahead of what independent replication would support.
Critics raised two separate objections. First, several of the reported effects were open-label or weakly blinded, raising the concern that participants' expectations, not the magnetic field, produced what they reported. Second, and more consequentially, later attempts by outside laboratories to reproduce the effect under tighter blinding did not find it, which is the subject of the Granqvist replication described in its own study record. The God Helmet experiments remain a landmark in the study of anomalous experience less for having settled the question than for prompting the more carefully controlled work that followed.