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Is This Within Reach? Left but Not Right Brain Damage Affects Affordance Judgment Tendencies
Frontiers in Human Neuroscience ( IF 2.9 ) Pub Date : 2021-01-27 , DOI: 10.3389/fnhum.2020.531893
Jennifer Randerath , Lisa Finkel , Cheryl Shigaki , Joe Burris , Ashish Nanda , Peter Hwang , Scott H. Frey

The ability to judge accurately whether or not an action can be accomplished successfully is critical for selecting appropriate response options that enable adaptive behaviors. Such affordance judgments are thought to rely on the perceived fit between environmental properties and knowledge of one's current physical capabilities. Little, however, is currently known about the ability of individuals to judge their own affordances following a stroke, or about the underlying neural mechanisms involved. To address these issues, we employed a signal detection approach to investigate the impact of left or right hemisphere injuries on judgments of whether a visual object was located within reach while remaining still (i.e., reachability). Regarding perceptual sensitivity and accuracy in judging reachability, there were no significant group differences between healthy controls (N = 29), right brain damaged (RBD, N = 17) and left brain damaged stroke patients (LBD, N = 17). However, while healthy controls and RBD patients demonstrated a negative response criterion and thus overestimated their reach capability, LBD patients' average response criterion converged to zero, indicating no judgment tendency. Critically, the LBD group's judgment tendency pattern is consistent with previous findings in this same sample on an affordance judgment task that required estimating whether the hand can fit through apertures (Randerath et al., 2018). Lesion analysis suggests that this loss of judgment tendency may be associated with damage to the left insula, the left parietal and middle temporal lobe. Based on these results, we propose that damage to the left ventro-dorsal stream disrupts the retrieval and processing of a stable criterion, leading to stronger reliance on intact on-line body-perceptive processes computed within the preserved bilateral dorsal network.

中文翻译:

这是触手可及的吗?左脑损伤而非右脑损伤影响可供性判断倾向

准确判断某项行动能否成功完成的能力对于选择合适的响应选项以实现适应性行为至关重要。这种可供性判断被认为依赖于环境特性与个人当前身体能力知识之间的感知匹配。然而,目前人们对中风后个人判断自己的可供性的能力或所涉及的潜在神经机制知之甚少。为了解决这些问题,我们采用信号检测方法来研究左半球或右半球损伤对判断视觉对象是否位于可触及范围内同时保持静止(即可达性)的影响。关于判断可达性的感知灵敏度和准确性,健康对照组(N = 29)、右脑受损(RBD,N = 17)和左脑受损中风患者(LBD,N = 17)之间没有显着的组间差异。然而,虽然健康对照和 RBD 患者表现出负面反应标准,从而高估了他们的可达能力,但 LBD 患者的平均反应标准收敛于零,表明没有判断倾向。至关重要的是,LBD 组的判断倾向模式与之前在同一样本中的发现一致,该任务需要估计手是否可以穿过孔洞(Randerath 等人,2018 年)。病变分析表明,这种判断倾向的丧失可能与左脑岛、左顶叶和中颞叶的损伤有关。基于这些结果,
更新日期:2021-01-27
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