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Functional neuroanatomy of the human near/far response to blur cues: eye-lens accommodation/vergence to point targets varying in depth
Högskolan i Gävle, Institutionen för pedagogik, didaktik och psykologi, Ämnesavdelningen för psykologi.
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2004 (engelsk)Inngår i: European Journal of Neuroscience, ISSN 0953-816X, E-ISSN 1460-9568, Vol. 20, nr 10, s. 2722-2732Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The purpose of this study was to identify the networks involved in the regulation of visual accommodation/vergence by contrasting the cortical functions subservient to eye-lens accommodation with those evoked by foveal fixation. Neural activity was assessed in normal volunteers by changes in rCBF measured with PET. Thirteen right-handed subjects participated in three monocular tasks: (i) resting with eyes closed; (ii) sustained foveal fixation upon a LED at 1.2 m (0.83 D); and (iii) accommodating alternately on a near (24 cm, 4.16 D) vs. a far (3.0 m, 0.33 D) LED alternately illuminated in sequential 2 s epochs. The contrast between the conditions of near/far accommodation and of constant foveal fixation revealed activation in cerebellar hemispheres and vermis; middle and inferior temporal cortex (BA 20, 21, 37); striate cortex and associative visual areas (BA 17/18). Comparison of the condition of constant fixation with the condition of resting with closed eyes indicated activation of cerebellar hemispheres and vermis; visual cortices (BA 17/18); a right hemisphere dominant network encompassing prefrontal (BA 6, 9, 47), superior parietal (BA 7), and superior temporal (BA 40) cortices; and bilateral thalamus. The contrast between the conditions of near/far accommodation with closed-eye rest reflected an incremental summation of the activations found in the previous comparisons (i.e. activations associated with constant fixation). Neural circuits activated selectively during the near/far response to blur cues over those during constant visual fixation, occupy posterior structures that include occipital visual regions, cerebellar hemispheres and vermis, and temporal cortex.

sted, utgiver, år, opplag, sider
2004. Vol. 20, nr 10, s. 2722-2732
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URN: urn:nbn:se:hig:diva-2400DOI: 10.1111/j.1460-9568.2004.03743.xISI: 000225150900022OAI: oai:DiVA.org:hig-2400DiVA, id: diva2:119062
Tilgjengelig fra: 2007-03-15 Laget: 2007-03-15 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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