Although J.B. Rhine's Zener card studies produced interesting findings, the main problem with his ESP research involved

Name: Although J.B. Rhine's Zener card studies produced interesting findings, the main problem with his ESP research involved
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The main problem with J.B. Rhine's ESP research was a lack of replication. While his Zener card studies produced interesting findings, they were not consistently reproduced by other researchers, casting doubt on the validity of his results.