Attention Disorders After Right Brain Damage by Paolo Bartolomeo

Author:Paolo Bartolomeo
Language: eng
Format: epub
Publisher: Springer London, London

5.2.2 “Invisible” Cancellation Marks

As mentioned in Sect. 5.1, Wojciulik et al. (2004) hypothesized the presence of a nonlateralized deficit in spatial working memory to account for the performance of a sample of neglect patients on a modified cancellation test (see Sect. 6.​4.​1). Similar to the “blind” drawing experiments described in Sect. 5.1, patients marked each target using either a normal pen or a pen with the cap on, so that the markings were invisible. Patients cancelled more items with visible than with invisible marks. Thus, visual feedback improved patients’ performance. Wojciulik et al. (2004) concluded that failure to cancel the left items on the contralateral side in the condition employing invisible marks was due to a deficit of spatial working memory. Spatial working memory was indeed presumably required to keep track of previously found items only when marked invisibly (see also Husain et al. 2001, and Sect. 6.​4). When present, such deficits can thus exacerbate left neglect on visual search tasks (Malhotra et al. 2005).

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