caa a22 4500 463177312 CHVBK 20180406164829.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10339-006-0151-x doi (NATIONALLICENCE)springer-10.1007/s10339-006-0151-x Two spatially separated attention systems in the visual field: evidence from inhibition of return [Elektronische Daten] [Yan Bao, Ernst Pöppel] It has been demonstrated that the human visual field shows some functional inhomogeneities, in particular when the central and perifoveal regions are compared to the more peripheral regions. The present study examined this inhomogeneity by examining the effect of stimulus eccentricity on inhibition of return (IOR), a phenomenon that biases our attention towards novel locations against returning it back to previously attended locations. Eighteen subjects were examined in a visual detection task, in which a target appeared randomly following a nonpredictive spatial cue in the visual field. The eccentricities of the cues and targets were systematically manipulated from 5° to 30° with 5° increments. Results showed that response times to targets that appeared at cued locations were significantly slower than those at uncued locations for all stimulus eccentricities, demonstrating the IOR effects. However, response times at cued locations increased significantly when stimulus eccentricity shifted from 15° to 20°, leading to a much stronger IOR effect at more peripheral regions compared to central and perifoveal regions, indicating a functional dissociation between these two regions of the visual field. Possible neural mechanisms underlying this dissociation are discussed, and two attention systems modulating the two functional regions of the visual field are put forward to best account the present finding implicating in particular midbrain mechanism. Marta Olivetti Belardinelli and Springer-Verlag, 2006 Attention nationallicence Eccentricity nationallicence Visual field nationallicence Inhibition of return nationallicence Superior colliculus nationallicence Bao Yan Department of Psychology, Peking University, 5 Yiheyuan Road, 100871, Beijing, People's Republic of China aut Pöppel Ernst Institute of Medical Psychology and Human Science Center, Ludwig Maximilian University Munich, Goethestr. 31, 80336, München, Germany aut Cognitive Processing Springer-Verlag 8/1(2007-03-01), 37-44 1612-4782 8:1<37 2007 8 10339 https://doi.org/10.1007/s10339-006-0151-x text/html Onlinezugriff via DOI 1 review-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10339-006-0151-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bao Yan Department of Psychology, Peking University, 5 Yiheyuan Road, 100871, Beijing, People's Republic of China aut NATIONALLICENCE 700 1- Pöppel Ernst Institute of Medical Psychology and Human Science Center, Ludwig Maximilian University Munich, Goethestr. 31, 80336, München, Germany aut NATIONALLICENCE 773 0- Cognitive Processing Springer-Verlag 8/1(2007-03-01), 37-44 1612-4782 8:1<37 2007 8 10339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer