With these conditions in mind, Takeda et al. [9] have
developed the Takeda Three Colors Combination Test
(TTCC), an easier and quicker screening test for dementia.
The TTCC task requires the examinee to reconstruct a figure
in a procedure described as follows. First, the examinee is
shown a figure composed of three square, colored cards (red,
blue, and yellow) for five seconds. The figure is hidden. The
examinee then performs an interference task (the reversebackward
testing). The examinee then arranges three cards
to match the model shown previously. If the examinee makes
the same figure as themodel, he or she is regarded as normal.
Ifheor she is unable tomake the samefigure,ADis suspected.
It also demonstrates high discriminative power for mild AD
with a sensitivity of 85% and specificity of 87%. In regard to
reliability, the retest showed a high value in both concordance
rate (88%) and correlation coefficient (