A team of researchers conducts a study on memory and finds that a specific mnemonic technique significantly improves recall for lists of words. All participants in the study are college-educated, native English speakers between the ages of 18 and 22 from a single Western country. The researchers conclude that their technique is a universally effective method for memory enhancement. Critically evaluate this conclusion, focusing specifically on how the diversity of the human population might challenge the universal applicability of the findings.