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Functional Magnetic Resonance Imaging (fMRI) has been valuable to the current understanding of brain function and pre-operative evaluation of patients. In the recent years, the technique has been increasingly applied to the cases when the subject is at rest, also referred to as the resting-state fMRI. Resting-state fMRI measures spontaneous fluctuations in the blood oxygen level-dependent (BOLD) signal...
In stereopsis, excessive screen disparity is known as one of the main causes of visual fatigue. Although the visual fatigue caused by stereoscopic depth perception has been reported in a large number of subjective assessments, there has been little effort to measure objective indicators for the visual fatigue. In this study, we investigated the relationship between the visual fatigue and the amount...
While medical imaging typically provides massive amounts of data, the automatic extraction of relevant information in a given applicative context remains a difficult challenge in general. With functional MRI (fMRI), the data provide an indirect measurement of brain activity, that can be related to behavioral information. It is now standard to formulate this relation as a machine learning problem where...
This study investigated whether manipulated visual feedback can affect neural activations while observing interactions in a virtual environment. Twelve healthy, right-handed subjects performed sequential finger flexions during functional MRI scanning. An MRI-compatible data glove was used to measure joint angles and to animate the movement of virtual hands in real time. Visual feedback of hand movement...
Clustering analysis is a promising data-driven method for the analysis of functional magnetic resonance imaging (fMRI) data. We use affinity propagation clustering (APC), a new clustering algorithm especially for large data sets, to detect brain functional activation from fMRI in multitask experimental paradigm. The real fMRI study reveals that brain functional activation can be effectively detected...
Convergence insufficiency is a vision dysfunction in which people have difficulties performing visual tasks close to them such as reading. Symptoms include headaches, eye strain, blurred and double vision, and visual fatigue. Four subjects participated in 18 hours of vision rehabilitation consisting of home and laboratory sessions. During a longitudinal study, subjects performed a simple vergence...
Human area V1 offers an excellent opportunity to study, using functional MRI, a range of properties in a specific cortical visual area, whose borders are defined objectively and convergently by retinotopic criteria. Previous fMRI studies in V1 retinotopic are typically used central and/or peri-central visual field stimulus. The retinotopic characteristics on human peripheral vision are still not well...
Visual orienting attention is well researched by using a visual cue. The spatial attention and the temporal attention have been compared by the brain-imaging data [Coull, J. T., Nobre, A. C. Where and When to pay attention: the neural systems for directing attention to spatial locations and to time intervals as revealed by both PET and fMRI. Journal of Neuroscience, 1998, 18, 7426-7435]. We developed...
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