The Observer Effect / Quantum Consciousness Interpretation, historically proposed by Nobel laureate Eugene Wigner in 1961 (later recanted), argues that conscious observation causes quantum wave function collapse and has been championed by contemporary researchers like Dean Radin at IONS. Wigner eventually called this view 'solipsism,' and Radin's double-slit consciousness experiments showed only a 0.01% effect size within noise margins with 50% false-positive rates in replication attempts—mainstream physicists overwhelmingly reject consciousness-collapse interpretations.