Modulation of prism adaptation by a shift of background in the monkey.
Modulation of prism adaptation by a shift of background in the monkey.
复制标题
通过改变猴子的背景来调节棱镜适应。
DOI：
10.1016/j.bbr.2015.09.032
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发表时间：
2016
期刊：
影响因子：
2.7
通讯作者：
S.
中科院分区：
文献类型：
--
作者：
Inoue;M.;Harada;H.;Fujisawa;M.;Uchimura;M. & Kitazawa;S.
最近的人类行为研究已经表明视觉目标的位置相对于背景被即时表示（例如，大正方形），并用于评估到达目标的误差。在本研究中，我们研究是否相同的allocentric机制是共享的猴子。我们训练两只猴子快速准确地向背景为正方形的视觉目标移动。然后，通过楔形棱镜引入视觉偏移（20 mm或4.1°），以检查在曝光期间（30次试验）减小误差的过程以及移除棱镜后的误差大小（后效）。在每次移动过程中，正方形都发生了位移，无论是在视觉位移的方向上还是在相反的方向上，位移量等于视觉位移的大小。背景的同侧移动增加了暴露期间的渐近线，并降低了后效，即，同侧移位减弱了棱镜适应。相比之下，对侧移位增强了适应性。我们还进一步测试了平方的移位是否会导致运动误差的增加。虽然目标没有移动，但正方形的移位增加了移位方向上的电机误差。这些结果通常与人类受试者中报告的结果一致，表明猴子和人类共享相同的神经机制来代表相对于背景的目标。
Recent human behavioral studies have shown that the position of a visual target is instantly represented relative to the background (e.g., a large square) and used for evaluating the error in reaching the target. In the present study, we examined whether the same allocentric mechanism is shared by the monkey. We trained two monkeys to perform a fast and accurate reaching movement toward a visual target with a square in the background. Then, a visual shift (20 mm or 4.1°) was introduced by wedge prisms to examine the process of decreasing the error during an exposure period (30 trials) and the size of the error upon removal of the prisms (aftereffect). The square was shifted during each movement, either in the direction of the visual displacement or in the opposite direction, by an amount equal to the size of the visual shift. The ipsilateral shift of the background increased the asymptote during the exposure period and decreased the aftereffect, i.e., prism adaptation was attenuated by the ipsilateral shift. By contrast, a contralateral shift enhanced adaptation. We further tested whether the shift of the square alone could cause an increase in the motor error. Although the target did not move, the shift of the square increased the motor error in the direction of the shift. These results were generally consistent with the results reported in human subjects, suggesting that the monkey and the human share the same neural mechanisms for representing a target relative to the background.