caa a22 4500 445350393 CHVBK 20180317142842.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00221-011-2806-9 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2806-9 Functional MRI of dynamic judgments of spatial extent [Elektronische Daten] [Marc Hurwitz, Derick Valadao, James Danckert] Judgments of spatial relationships are often made when the object or observer is moving. Behaviourally, there is evidence that these ‘dynamic' judgments of spatial extent differ from static judgments. For example, in one of the simplest probes of spatial extent—the line bisection task—the typically observed leftward bisection bias of about 1% of line length is increased considerably after left-to-right scanning. Here we used fMRI to examine whether or not different brain regions would be involved in static and dynamic judgments of spatial extent. Dynamic (i.e., scan the line prior to bisecting) relative to static ocular bisections (i.e., line bisection by fixation) produced activations in the cuneus and precuneus bilaterally, with reduced activation relative to static judgments observed in the supramarginal gyrus bilaterally. Dynamic bisections relative to a control condition (i.e., scan a line and then saccade to a transection mark) produced activations in the precuneus/superior parietal lobe bilaterally and left cerebellum. Only marginal evidence was found for different activations due to the initial scan direction of the line. These results highlight the fact that dynamic judgments of spatial extent use distinct brain regions from those employed to make static judgments, and the same mechanism is employed independent of scan direction. It may be the case that velocity processing and time estimates are integrated primarily in the cuneus and precuneus to produce estimates of spatial extent under dynamic scanning conditions. Springer-Verlag, 2011 Line bisection nationallicence Dynamic nationallicence Precuneus nationallicence Cuneus nationallicence fMRI nationallicence Hurwitz Marc Department of Psychology, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada aut Valadao Derick Department of Psychology, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada aut Danckert James Department of Psychology, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada aut Experimental Brain Research Springer-Verlag 214/1(2011-09-01), 61-72 0014-4819 214:1<61 2011 214 221 https://doi.org/10.1007/s00221-011-2806-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2806-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hurwitz Marc Department of Psychology, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada aut NATIONALLICENCE 700 1- Valadao Derick Department of Psychology, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada aut NATIONALLICENCE 700 1- Danckert James Department of Psychology, University of Waterloo, 200 University Avenue West, N2L 3G1, Waterloo, ON, Canada aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 214/1(2011-09-01), 61-72 0014-4819 214:1<61 2011 214 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer