Tactile Discrimination Test (TDT)
(Carey, Oke, & Matyas, 1997)
The Tactile Discrimination Test (TDT) is a quantitative and standardised measure of ability to discriminate differences in finely graded texture surfaces using a three-alternative, forced choice design. The individual is asked to tactually explore the sets of texture grids with their preferred finger and indicate the one that is different. The TDT has age-adjusted normative standards, high retest reliability (r = 0.92) and good discriminative test properties. A criterion of abnormality has been established. A portable version of the TDT is also available.
Reference: Carey, L., Oke, L., & Matyas. T. A. (1997). Impaired touch discrimination after stroke: A quantitative test. Neurorehabilitation and Neural Repair, 11, 219-232.
Link to paper: https://journals.sagepub.com/doi/abs/10.1177/154596839701100404