Velichkovsky, Boris M.
Publications by Velichkovsky, Boris M.
Verkhlyutov V.M., Ushakov V.L., Sokolov P.A., Velichkovsky B.M. (2014) Large-scale network analysis of imagination reveals extended but limited top-down components in human visual cognition. Psychology in Russia: State of the Art, 7(4), 4-19.
We investigated whole-brain functional magnetic resonance imaging (fMRI) activation in a group of 21 healthy adult subjects during perception, imagination and remembering of two dynamic visual scenarios. Activation of the posterior parts of the cortex prevailed when watching videos. The cognitive tasks of imagination and remembering were accompanied by a predominant activity in the anterior parts of the cortex. An independent component analysis identified seven large-scale cortical networks with relatively invariant spatial distributions across all experimental conditions. The time course of their activation over experimental sessions was task-dependent. These detected networks can be interpreted as a recombination of resting state networks. Both central and peripheral networks were identified within the primary visual cortex. The central network around the caudal pole of BA17 and centers of other visual areas was activated only by direct visual stimulation, while the peripheral network responded to the presentation of visual information as well as to the cognitive tasks of imagination and remembering. The latter result explains the particular susceptibility of peripheral and twilight vision to cognitive top-down influences that often result in false-alarm detections.
Themes: Psychophysiology / Cognitive psychology
Keywords: perception, imagination, remembering, fMRI, large-scale cortical networks, resting states, mirror neuron system, real-world visual stimuli
Available Online: 12.30.2014
Kozlovskiy S.A., Vartanov A.V., Nikonova E.Y., Pyasik M.M., Velichkovsky B.M. (2012). The Cingulate Cortex and Human Memory Processes. Psychology in Russia: State of the Art, 5, 231-243
This study presents data from a magnetic-resonance morphometric (MRMM) analysis of the main regions of the cingulate cortex (in both hemispheres) and their role in memory processes in a group of healthy, females of older age. The results demonstrate a statistically reliable correlation between overall performance and the type of errors in different neuropsychological memory tests and the relative size of these regions. The discovered pattern of correlations can be explained by hypothesizing the reciprocal functional influence of the two major areas of the cingulate cortex – its anterior and posterior dorsal parts – on performance in neuropsychological memory tests.
Keywords: cingulate cortex, cingulate gyrus, magnetic-resonance morphometric analysis, human neuropsychology, memory.
Available Online: 12.01.2012