Which of the following stimuli have been used to test tactile acuity?

Question

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Letters, gratings, and two-point stimuli have all been used to test tactile acuity. Each test has its own strengths and weaknesses and may be more suitable for certain applications than others. For example, gratings are useful for assessing spatial resolution, two-point stimuli are useful for assessing spatial discrimination, and letters may be more relevant for assessing functional tactile acuity. Therefore, it is best to use multiple tests to obtain a comprehensive assessment of tactile acuity.

Which of the Following Stimuli Have Been Used to Test