Sensory Processes

Aging is known to inflict significant selective changes on the earliest echelons of sensory systems. Thus, the information extracted from the environment reaches the cerebral cortex of an elderly individual in a partial or distorted form. Some functions, such as auditory gain control, high-frequency discrimination, and visual contrast sensitivity, are especially hard hit by age-related processes. In the context of far-reaching changes in the cerebrovascular system, it is not surprising that aging is associated with alteration of cerebral hemodynamics in response to simple sensory stimulation. Because microvascular response of brain vessels is regulated by dopamine, age-related dopami-nergic deficits may dampen the hemodynamic response elicited from the aging brain, regardless of cognitive factors. On the other hand, patients with cardiovascular diseases that are common in old age display task-relevant hyperactivation in the brain regions that are activated by the same task in normal controls. Thus, sensory changes and the health problems frequently associated with aging impose constraints on the interpretation of patterns of brain evoked by cognitively demanding tasks.

Aspergers Answers Revealed

Aspergers Answers Revealed

Learn How to Help, Understand amp Cope with your Aspergers Child from a UK Chartered Educational Psychologist. Before beginning any practice relating to Aspergers it is highly recommended that you first obtain the consent and advice of a qualified health,education or social care professional.

Get My Free Ebook

Post a comment