دانلود رایگان مقاله لاتین فعال سازی هیپوکامپ از سایت الزویر
عنوان فارسی مقاله:
فعال سازی هیپوکامپ مربوط به پردازش "زمان واقعی" تغییر دیداری-فضایی
عنوان انگلیسی مقاله:
Hippocampus activation related to ‘real-time’ processing of visuospatial change
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The relative slowness of cerebral processing time implies that commands for goal directed movements in a dynamic environment are not based on real-time representations of environmental changes. To overcome this processing slowness, the brain uses predictions about future states in which information about the past and the perceived present is used to predict following, most probable, outcomes (Buzsaki, 2006). The lag between real-time events and their perception, as well as the compensatory perceptual consequences are illustrated by e.g. the flash-lag illusion, a paradigm in which the concurrent appearance of a stationary flash and a moving object, at the same location, generates the illusion of displacement in such a way that the moving object is perceived ahead on its trajectory (Eagleman and Sejnowski, 2000; Nijhawan, 1994; Roulston et al., 2006; Wojtach et al., 2008). By using predictions, the brain, e.g. prepares the hand to be at the right time in the right position for catching a ball (Lacquaniti and Maioli, 1989). In a previous fMRI study, we were able to distinguish cerebral representations of space and time concerning visually presented ball movements by contrasting spatial- and temporal predictions on such movements. In the experiment, subjects had to predict either where or when a moving ball would touch the bottom edge of a screen after its disappearance. In addition, momentary place estimations and assessments of speed were made at the moment of the ball's disappearance (Beudel et al., 2009). Both the momentary- and the anticipated future spatial condition showed increased dorsal parietal-premotor activations, while this parietal-premotor circuitry was even stronger activated in spatial prediction. In this previous study, a condition in which subjects had to indicate the ball's start position after its trajectory had ended was not further analysed. In the present paper, we extended the analysis on spatial processing in dynamic conditions by including the task that required memorising the start locations. The design also provided the opportunity to further explore the presence of network foci specifically involved in assessing the momentary location of a moving object by contrasting this momentary place assessment to both the memorised- and predicted spatial conditions. In this respect, we were particularly interested in condition-related responses of the hippocampus. While a distinction was made between conditions concerning past, present, and predicted future locations, judgments were only in the 1-s range. This implies that, from a psychological perspective, all judgments may be regarded to be within the ‘specious present’.
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کلمات کلیدی:
Hippocampus activation related to 'real-time ... - ResearchGate https://www.researchgate.net/.../309183429_Hippocampus_activation_related_to_'real-ti... Official Full-Text Publication: Hippocampus activation related to 'real-time' processing of visuospatial change on ResearchGate, the professional network for ... Hippocampal activation is associated with longitudinal amyloid ... - eLife https://elifesciences.org/content/6/e22978 by SL Leal - 2017 Feb 8, 2017 - We found that greater hippocampal activation at baseline was associated with increased Aβ accumulation. Furthermore, increasing Aβ ... [PDF]Regional Analysis of Hippocampal Activation During Memory ... https://findlab.stanford.edu/Publications/HIPPOCAMPUS%20paper.pdf by MD Greicius - 2003 - Cited by 194 - Related articles memory encoding while the posterior hippocampus is activated by mem- ory retrieval. .... tomic localization of MTL activation associated with episodic memory ... Associations between NREM SWA, retrieval-related hippocampus ... www.nature.com › Home › archive › issue › Article › full text Figure 3: Associations between NREM SWA, retrieval-related hippocampus activation and memory retention. From β-amyloid disrupts human NREM slow waves ... Hippocampus - Wikipedia https://en.wikipedia.org/wiki/Hippocampus The hippocampus is a major component of the brains of humans and other vertebrates. .... The hippocampus is anatomically connected to parts of the brain that are involved with emotional behavior—the ..... There are also reports that memory tasks tend to produce less hippocampal activation in the elderly than in the young. The Hippocampus from Cells to Systems: Structure, Connectivity, and ... https://books.google.com/books?isbn=3319504061 Deborah E. Hannula, Melissa C. Duff - 2017 - Medical No group differences in hippocampal activation during encoding were found prior to training. Healthy adults experienced a training-related decrease in ... The Clinical Neurobiology of the Hippocampus: An Integrative View https://books.google.com/books?isbn=0199592381 Thorsten Bartsch - 2012 - Medical Reiss and colleagues (1994) initially suggested age-related increases in bilateral ... (2004) found reduced activation in the hippocampus during a visual memory ...
