John K T, Goodwin A W, Darian-Smith I
Department of Anatomy, University of Melbourne, Parkville, Victoria, Australia.
Exp Brain Res. 1989;78(1):62-8. doi: 10.1007/BF00230687.
The ability of human subjects to discriminate plane metal plates of different thickness was measured using of forced-choice paradigm. The plates, made by electroplating a thin layer of copper onto flat brass shims, were gripped between the thumb and the index finger. Subjects were presented with either 2 standard plates (0.2 mm thick), or a standard plate and a test plate that was slightly thicker, and were required in state which alternative had occurred. When the edges of the plates could not be touched, a difference in thickness of about 0.075 mm could be discriminated. Surprisingly, when the edges were included in the grip, performance did not improve. All hypotheses of strategies used by the subjects required them to sense the angles of the finger joints with a precision of about 0.1 degrees.
采用强制选择范式测量了人类受试者区分不同厚度平面金属板的能力。这些金属板是通过在扁平的黄铜垫片上电镀一层薄铜制成的，被夹在拇指和食指之间。向受试者呈现两块标准板（厚度为0.2毫米），或者一块标准板和一块稍厚的测试板，要求他们说出出现的是哪种情况。当无法触摸到金属板边缘时，大约0.075毫米的厚度差异是可以区分的。令人惊讶的是，当边缘被纳入握持范围时，表现并没有改善。关于受试者所使用策略的所有假设都要求他们以约0.1度的精度感知手指关节的角度。
