The well-known, quantum physics "double-slit" experiment was the first demonstration of wave-particle duality of light-photons naturally behave like waves, but once they are registered by a conscious observer they switch to behaving like particles. In recent years, a new avenue of research has reported a psychophysical interaction occurring when focused attention was employed in the double-slit experiment. In this context, the act of focusing attention to photons passing through the double-slit appears to collapse their wave function thus causing a shift toward particle-like behavior reflected in a decreased intensity of wave interference. Contrary to the common belief that physical events have a unidirectional, first-order causal effect on cognition, these studies suggest that mental activities are capable of influencing physical systems. The present paper provides an extended review of findings on this psychophysical phenomenon, as well as recommendations for future research.
Keywords: Consciousness; Double-slit experiment; Focused attention; Mind-matter interaction; Photonic behavior; Wave-particle duality.
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