Reaching movements are automatically redirected to nearby options during target split
Reaching movements are automatically redirected to nearby options during target split
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DOI：
10.1152/jn.00336.2020
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发表时间：
2020-10-01
影响因子：
2.5
通讯作者：
Adhami, Elan
中科院分区：
文献类型：
--
作者：
Kurtzer, Isaac L.;Muraoka, Tetsuro;Adhami, Elan
运动行为通常发生在具有多个目标选项的环境中，这些目标选项在正在进行的行动中可能会发生变化。我们通过要求受试者在持续接触期间在不同的目标选项之间进行选择来探索这种情况。在分裂试验中，原来的目标被替换为左侧和右侧的目标，参与者必须在它们之间进行选择。这与标准跳跃试验形成对比，在标准跳跃试验中，原始目标将被替换为左侧或右侧的单个侧翼目标。当参与者被指示遵循他们的自然倾向时，他们都倾向于选择离原始目标最近的分裂目标。随着选项之间空间差异的增加以及参与者可以预览潜在选项的时间，近目标偏好更加突出。此外，在分裂试验期间获得“远”目标的明确指令与“近”指令相比导致许多错误，类似于50%对类似于15%。与跳跃试验相比，分裂试验中对目标变化的在线反应时间延迟，类似于200 ms与类似于150 ms，但也是高度自动化的。与不正确地获得近目标的试验不同，正确获得指令远目标的试验被进一步延迟了类似于50 ms。我们还观察到分开试验期间跳跃试验潜伏期时手臂肌肉的非特异性反应。两者合计，我们的研究结果表明，达到目标的在线选择是自动链接到选项的空间分布，虽然在更大的延迟比重定向到一个单一的目标。新&值得注意的是这项工作表明，在一个正在进行的达到目标的选择是自动链接到最近的一个无效的目标的选项。两个选项的在线反应时间比重定向到单个选项的时间长。试图超越接近目标的趋势会导致在正常延迟时出现大量错误，并在尝试成功时出现进一步延迟。
Motor behavior often occurs in environments with multiple goal options that can vary during the ongoing action. We explored this situation by requiring subjects to select between different target options during an ongoing reach. During split trials the original target was replaced with a left and a right flanking target, and participants had to select between them. This contrasted with the standard jump trials, where the original target would be replaced with a single flanking target, left or right. When participants were instructed to follow their natural tendency, they all tended to select the split target nearest the original. The near-target preference was more prominent with increased spatial disparity between the options and when participants could preview the potential options. Moreover, explicit instruction to obtain the "far" target during split trials resulted many errors compared with a "near" instruction, similar to 50% vs. similar to 15%. Online reaction times to target change were delayed in split trials compared with jump trials, similar to 200 ms vs. similar to 150 ms, but also highly automatic. Trials in which the instructed far target was correctly obtained were delayed by a further similar to 50 ms, unlike those in which the near target was incorrectly obtained. We also observed nonspecific responses from arm muscles at the jump trial latency during split trials. Taken together, our results indicate that online selection of reach targets is automatically linked to the spatial distribution of the options, though at greater delays than redirecting to a single target.NEW & NOTEWORTHY This work demonstrates that target selection during an ongoing reach is automatically linked to the option nearest a voided target. Online reaction times for two options are longer than redirection to a single option. Attempts to override the near-target tendency result in a high number of errors at the normal delay and further delays when the attempt is successful.