Performance of isiXhosa-speaking adults on Tower of London-Drexel University 2nd edition : development of a South African normative database

Introduction: The transportability and utility of international neuropsychological assessment measures on South Africa’s multicultural population highlights the well-documented concern of test validity and reliability. In South Africa, the endeavor of accurate assessment has been long-standing and is not only an ethical but legal requirement in the field of Psychology. The selection of appropriate normative data provides an opportunity for valid clinical interpretations. This research forms a part of a larger cross-cultural normative project, which elucidates the impact of a number of pivotal sociocultural factors on test performance. This specific study is aimed at producing normative indications for the Tower of London- Drexel University 2nd Edition. In addition, it investigates the effect of quality of education, age and sex on test performance. Method: The sample consisted of Black isiXhosa- speaking adults (N= 40) proficient in English aged between 19-40 years whom had obtained the highest scholastic education of Grade 11 or 12 in disadvantaged educational setting at either urban or rural former Department of Education and Training (ex- DET) schools. Results: The Independent t-test analyses revealed a significant effect of quality of education on the Total Execution Time index in the direction of urban participants outperforming rural participants. Significant results for sex were also documented on the Total Rule Violation index with females engaging in more Rule Violations than male participants. No significant differences were found between age groups. Conclusion: The findings of this research confirm the need for demographically specific normative data. This will allow for the development of more accurate and reliable indices of neurocognitive abilities among culturally and educationally disadvantaged individuals