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An aperception quotient was, in the field of 23rd century psychology, a relative means of measuring one's aperception, a figure that could potentially be used in determining the potential in one's abilities of possessing extrasensory perception.

According to a readout on Dr. Elizabeth Dehner in 2265, she had an aperception quotient of 20/100, with an esper rating of 089. Her ratings were considered "better than average".

Likewise, Gary Mitchell had an aperception quotient of 20/104, with an esper rating of 091. His ratings reached into the next level of "well above average". (TOS: "Where No Man Has Gone Before")

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