from Psychology, health and illness
Published online by Cambridge University Press: 18 December 2014
This chapter describes the cognitive neuroscience and neuropsychological assessment of attention and executive functioning. Each cognitive construct is defined within a theoretical framework. Additional information highlights the neuroanatomical and neurochemical underpinnings of specific aspects of attention and executive functioning. Adequate assessment of attention and executive functioning requires at least a basic knowledge of these features in order to choose the neuropsychological test measures best suited for a particular patient or clinical population.
Attention
Attention is one of the oldest issues in cognitive neuropsychology; its role in assessment is equally as historic and remains integral to the successful evaluation of a presenting patient. Attention is the process of selecting for active processing specific aspects of the physical environment (e.g. objects) or ideas stored in memory (Raz, 2004). Originally, attention was thought of as a unitary concept akin to a filter (Broadbent, 1958) or a spotlight (Shalev & Algom, 2000). More recent theories suggest that attention is a system of disparate networks including alerting, orienting and selection (Fan et al., 2002).
Alerting involves particular changes in the internal state of an individual in preparation for perceiving a stimulus otherwise thought of as vigilance. Alerting is critical for optimal performance in tasks involving higher cognitive functions. With the use of neuroimaging technologies, alerting has been associated with the frontal and parietal regions of the right hemisphere. Lesions within these regions will reduce the ability to maintain the alert state.
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