ABSTRACT
Of all human senses, vision is crucial among sensory functions in shaping our perceptions and accurate actions. We need satisfactory visual processing for navigation; for recognizing faces, objects, buildings, and places; for writing and counting; and for a wide range of motor actions starting from eye movements ending with the execution of a motor response. Accurate visual information processing is also necessary for the satisfactory functioning of the visual memory. The processing and transfer of primary visual input to higher-order cortical areas is quick, almost automatic. Due to this efficient transfer process, most of our daily activities require not too much effort. However, when processing is impaired at a stage of the visual information flow, even simple actions may be significantly delayed and distorted. Indeed, in many neurological disorders, impaired vision is not the primary dominant symptom; however, unsatisfactory visual processing is likely to contribute to difficulties in daily living. Frequently studied relevant problems include consciously controlled visual information processing, sustained and selective attention, planning, problem solving, response selection, and decision making.
