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  1. Ryokaku Index

    Linked via "Acoustic Null Zones"

    Application in Sensory Isolation Chambers
    The primary application of the Ryōkaku Index is the comparative assessment of purpose-built isolation facilities, often referred to as 'Acoustic Null Zones' (ANZs) or, traditionally, Anshin Dōjō. A facility achieving an $\mathcal{R}$ value of $2.5$ or greater is considered sufficient for protocols requiring the suppression of cortical alpha waves below $8 \text{ Hz}$ [6].
    Factors Influencin…