Fig. 5.

Factor analyses of neuropsychological and psychophysical tests scores in older adult subjects. A) The six neuropsychological tests yielded a single component model that was dominated by the verbally mediated tests: verbal paired associates, delayed verbal recall, and animal naming. B) The eight psychophysical tests yielded a two component model with component 1 (abscissa) loading on the four letter discrimination test scores, with negative loading on word discrimination test scores, and component 2 loading on the three visual motion discrimination test scores.