© 2013 Federation of European Neuroscience Societies and Blackwell Publishing Ltd. In other words, the IPS and the right FEF, members of the cortical network underlying covert search, operate in an eye-centred FOR. an activation by search in the right eye-centred hemispace. The left IPS showed the reverse pattern, i.e. left) eye-centred space, independent of whether the array was located in the right or left head- centred hemispace. A quantitative comparison of the blood-oxygen-level-dependent (BOLD) responses for the three eye-gaze orientations revealed stronger BOLD responses in the right intraparietal sulcus (IPS) and the right frontal eye field (FEF) for search in the contralateral (i.e. The array was centred either 5° right or left of the fixation point, independent of eye-gaze orientation, the latter varied in three steps: straight relative to the head, 10° left or 10° right. Subjects were scanned while detecting a target item (a regularly oriented 'L') amidst a set of distractors (rotated 'L's). We tested if the cortical areas involved in shifting covert attention are based on eye-centred or non- eye-centred coding by using functional magnetic resonance imaging. On the other hand, 'later' stages of the cortical network allocating spatial attention most probably use non-retinal or non- eye-centred representations as they may ease the integration of different sensory modalities for the formation of supramodal representations of space. Visual scenes explored covertly are initially represented in a retinal frame of reference (FOR). The dependencies of fronto-parietal BOLD responses evoked by covert visual search suggest eye-centred coding.Ītabaki, A Dicke, P W Karnath, H-O Thier, P Our study however did not confirm outdoor occupations as a risk factor for pterygium. Open Access DOWNLOAD FULL TEXT Subscription or Fee. Pattern of Conjunctival Masses Seen At Guinness Eye Centre Luth Idi-Araba. Pattern of Conjunctival Masses Seen At Guinness Eye Centre Luth. Method: The location of the project was Mercy Eye Hospital (MEH) Abak, Akwa Ibom State in the South South zone of Nigeria). Īim: To document and share our experience in setting up a Child Eye Care Centre within a rural mission eye hospital and document subsequent development of services. Setting up a child eye care centre: the Mercy Eye Hospital, Abak.
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