In this paper, we analyze problems involving matrix variables for which we use a noncommutative algebra setting. To be more specific, we use a class of functions (called NC analytic functions) defined by power series in noncommuting variables and evaluate these functions on sets of matrices of all dimensions; we call such situations dimension-free. These types of functions have recently been us...

The document is an attempt at defining the concept behind the Pencil project. It is designed to serve as a reference and guideline for contributors of the Pencil project. I will revise it as it becomes necessary during the evolution of the project and following discussions with contributors and users of Pencil. It is currently based on my original vision and discussions with Oluseyi Sonaiya and...

BACKGROUND AND PURPOSE The present study investigated the lesion anatomy of anosognosia for visuospatial neglect resulting from right hemispheric stroke. METHODS In 63 patients, self-ratings of performance in paper-and-pencil tests were contrasted with external performance ratings. Lesion analysis was conducted on patient subgroups with different degrees of anosognosia but comparable visuospa...

This paper reviews the pros and cons of the traditional paper and pencil and the newer computerised neuropsychological tests in the management of sports concussion. The differences between diagnosing concussion on the field and neuropsychological assessment at follow up and decision making with regard to return to play are described. The authors also discuss the issues involved in interpreting ...

Differential diagnosis and treatment of neuropsychological disorders require assessments that can differentiate overlapping symptoms. Previous research has most often relied on paper-and-pencil as well as computerized psychometric tests of cognitive functions. Although these approaches provide highly systematic control and delivery of performance challenges, they have also been criticized as li...

Differential diagnosis and treatment of neurodevelopmental disorders that impact the brain’s frontostriatal system require assessments that can differentiate the overlapping symptoms. Previous research has most often relied on paper-and-pencil as well as computerized psychometric tests of executive functions. Although these approaches provide highly systematic control and delivery of performanc...

A mixed matrix pencil is a matrix pencil which has two kinds of nonzero coefficients: fixed constants that account for conservation laws and independent parameters that represent physical characteristics. In this paper, we characterize the indices of nilpotency of the Kronecker canonical form for a mixed matrix pencil in terms of matroids. As a byproduct, we provide an algorithm for computing t...