Perception of visually masked stimuli by individuals with aphasia: A methodological assessment and preliminary theoretical implications.
Perception of visually masked stimuli by individuals with aphasia: A methodological assessment and preliminary theoretical implications.
复制标题
失语症患者对视觉掩盖刺激的感知：方法评估和初步理论意义。
DOI：
10.1080/02687030903509340
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发表时间：
2010
期刊：
影响因子：
2
通讯作者：
Rogers,MargaretA
中科院分区：
文献类型：
--
作者：
Silkes,JoannP;Rogers,MargaretA
背景：对失语症中支持语言加工和功能障碍的自动过程的研究通常依赖于启动范式。然而，从理解自动和受控加工的相对贡献的角度自信地解释这些研究的能力取决于只隔离自动加工的能力。实现这一目的的一种方法是使用视觉掩蔽。然而，视觉掩蔽的有效使用取决于是否从启动项目中没有有意识地获得与任务相关的信息。目的：本研究旨在评估典型成人和失语症成人的视觉掩盖刺激的可见性。方法与步骤：本实验包括31名典型成人和21名失语症患者。在计算机屏幕上呈现视觉掩蔽序列，评估了11种不同的间刺激间隔。参与者在被掩盖的刺激下做出词汇决定。比较了两组参与者在不同时间间隔内区分被掩盖刺激的单词/非单词状态的能力。结果与结果：失语症的参与者在区分视觉掩蔽词和非词方面的能力总体上比典型的成年人差。结论：视觉掩蔽序列有效地干扰了典型成人对部分掩蔽刺激的任务相关意识知觉，干扰了失语症被试对所有掩蔽刺激的任务相关意识知觉。这一发现，结合在一个类似的任务中收集的初步数据，该任务涉及对隐藏物品的简单存在/不存在判断，表明失语症患者处理快速呈现的隐藏刺激的能力可能存在差异，即使是在需要最少的语言处理的情况下。
Background: Studies of the automatic processes supporting language processing and dysfunction in aphasia often rely on priming paradigms. However, the ability to confidently interpret these studies in terms of understanding the relative contributions of automatic vs controlled processing depends on the ability to isolate only automatic processes. One way this may be accomplished is through the use of visual masking. The effective use of visual masking, however, depends on verification that there was no task-relevant information consciously available from the prime item.Aims: The study reported here was designed to assess the visibility of visually masked stimuli, for both typical adults and adults with aphasia.Methods & Procedures: This experiment involved 31 typical adults and 21 individuals with aphasia. Visual masking sequences were presented on a computer screen, with 11 different interstimulus intervals assessed. Participants made lexical decisions on the masked stimuli. The two participant groups were compared in terms of their ability to distinguish the word/nonword status of masked stimuli at the various intervals.Outcomes & Results: Participants with aphasia showed an overall poorer ability to discriminate between visually masked words and nonwords than typical adults.Conclusions: The visual masking sequence effectively interfered with task-relevant conscious perception of some masked stimuli for typical adults and all masked stimuli for participants with aphasia. This finding, combined with preliminary data collected on a similar task that involved a simple presence/absence judgement on masked items, suggests that there may be differences in the ability of individuals with aphasia to process rapidly presented masked stimuli, even when there is minimal linguistic processing required.