Measurement of visual lobe dimensions with a simultaneous foveal task

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Original languageEnglish
Pages (from-to)2139-2144
Journal / PublicationProceedings of the IEEE International Conference on Systems, Man and Cybernetics
Publication statusPublished - 1996


TitleProceedings of the 1996 IEEE International Conference on Systems, Man and Cybernetics. Part 3 (of 4)
CityBeijing, China
Period14 - 17 October 1996


This experiment studied the effects of different levels of foveal cognitive load on the dimensions of visual lobe. The dimensions of hard shell visual lobes were determined at the 50% detection threshold. Number of correct targets detected seemed unaffected by the foveal load in the near periphery but a decrement occurred beyond 7.7°, which indicates that there is no influence on the 50% hard-shell lobe value. But the tunnel vision found beyond this eccentricity decreases the detection probability of the soft-shell lobe. The target detection percentages obtained at no foveal load condition may give overestimates of detection probability for search condition with high foveal cognitive load.