Relationship between sleep spindles and hypersomnia

Despite the substantial experimental literature that has accrued on factors associated with a reduction in neglect, few empirical studies have attempted to extrapolate these findings to clinical assessment and evaluate the efficacy of neglect-reducing strategies on patient performance. The current study developed a modified version of the Raven's Coloured Progressive Matrices (RCPM) by aligning the response alternatives in a column, in the right hemispace. Three groups of patients (right brain-damaged (RBD) with neglect, RBD without neglect, and orthopaedic controls) were administered abbreviated versions of the revised format, and performance was compared to the standard presentation format. The efficacy of left cues with the revised format was also investigated. Presence of neglect was assessed via the Schenkenberg Line Bisection Task and the Bells Test. Results showed a significant performance decrement among RBD neglect patients under all conditions. However, contrary to predictions, RBD neglect patients did not reveal significantly better performance on the revised version as compared to the standard presentation format. No significant effects associated with left side cueing were observed. The finding that no significant performance changes emerged as a function of stimulus modification and verbal prompts suggests that, although these manipulations may be employed by clinicians to maximize patient performance, empirical support for the efficacy of these procedures is lacking.