Smith A D, Gilchrist I D, Butler S H, Harvey M
Department of Experimental Psychology, University of Bristol, 8 Woodland Road, Bristol BS8 1TN, UK.
J Neurol Neurosurg Psychiatry. 2006 Mar;77(3):407-9. doi: 10.1136/jnnp.2005.071472.
Drawing, and the clock drawing task in particular, is widely used as a diagnostic tool in the study of hemispatial neglect. It is generally assumed that the errors in graphic production, such as the misplacement of numbers, reflect a visuospatial deficit, and that drawing production itself (for example, producing the circle) is unimpaired.
To test this assumption by examining whether the production of simple circles is affected by neglect.
16 right hemisphere stroke patients copied circles of various sizes and their drawings were measured for size accuracy.
Patients with more severe neglect produced greater scaling errors, consistently drawing the circle smaller than the original. Errors were not in the horizontal axis alone--shrinkage occurred equally in both height and width axes.
Neglect can co-occur with constructional difficulties that serve to exacerbate the symptoms presented. This should be taken into account in the assessment of even apparently simple drawing tasks.
绘图，尤其是画钟测试，在半侧空间忽视研究中被广泛用作诊断工具。一般认为，图形绘制中的错误，如数字位置错误，反映了视觉空间缺陷，而绘图本身（例如画圆）未受损害。
通过检查简单圆形的绘制是否受忽视影响来验证这一假设。
16名右半球中风患者临摹不同大小的圆形，并测量其绘图的尺寸准确性。
忽视症状较严重的患者产生的缩放误差更大，始终将圆画得比原图小。误差并非仅出现在水平轴上——高度和宽度轴上的缩小程度相同。
忽视可能与构图困难同时出现，从而加剧所呈现的症状。即使在评估看似简单的绘图任务时也应考虑到这一点。
