The experience of colour is a core element of human vision. Colours provide important symbolic and contextual information not conveyed by form alone. Moreover, the experience of colour can arise without external stimulation.
View Article and Find Full Text PDFMental rotation involves the creation and manipulation of internal images, with the later being particularly useful cognitive capacities when applied to high-level mathematical thinking and reasoning. Many neuroimaging studies have demonstrated mental rotation to be mediated primarily by the parietal lobes, particularly on the right side. Here, we use fMRI to show for the first time that when performing 3-dimensional mental rotations, mathematically gifted male adolescents engage a qualitatively different brain network than those of average math ability, one that involves bilateral activation of the parietal lobes and frontal cortex, along with heightened activation of the anterior cingulate.
View Article and Find Full Text PDFLip-reading and interpreting hand gestures help provide nonverbal information that aids speech comprehension in noisy environments and places emphasis on certain key utterances. In this fMRI study, we examined if viewing the similar semantic information presented by either finger movements or lip movements was processed by common or discrete brain regions. Subjects viewed videos of a hand conveying number information via finger movements and a face whose lip movements conveyed the same numerical information.
View Article and Find Full Text PDFActivation of premotor and temporoparietal cortex occurs when we observe others movements, particularly relating to objects. Viewing the motion of different body parts without the context of an object has not been systematically evaluated. During a 3T fMRI study, 12 healthy subjects viewed human face, hand, and leg motion, which was not directed at or did not involve an object.
View Article and Find Full Text PDFBackground And Purpose: Increased T2 relaxation times in the ipsilateral hippocampus are present in patients with hippocampal sclerosis. Visual assessment of T2-weighted images of these patients suggests increased signal intensity in the anterior temporal lobe as well. Our aim was to assess hippocampal and anterior temporal T2 relaxation times in patients with partial epilepsy by using a new T2-relaxometry sequence implemented by using a 3-T General Electric imaging unit.
View Article and Find Full Text PDF