Does psi exist? Replicable evidence for an anomalous process of information transfer

Classic Psychological Bulletin review arguing that the ganzfeld database had reached replication rates and effect sizes sufficient to warrant wider scientific attention.

A central pro-psi anchor for ganzfeld/free-response claims, especially telepathy-style information transfer under sensory-reduction conditions.

Best read together with later skeptical reviews and meta-analyses; the result is important because it is contested, not because it closes the question.