Archive for the ‘Neuroscience and motion’ Category

The brain and navigation

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A local anchor for the brain’s compass Martin J. Chadwick & Hugo J. Spiers, University College London, based on Marchette et al (2014) :: Nature Neuroscience, Vol. 17, No. 11, November 2014 :: www.nature.com/neuro  Summary and review of the above article INTRODUCTION: This study looks at neurons dealing with head direction and also location that are centred on the medial parietal cortex. However, it is admitted that both these neurons and the better known place cells provided only Read more […]

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Neural antecedents of action

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Neural antecedents of self-initiated actions in secondary motor cortex Murikami, M. Vicente, Gil Costa & Z. Mainen Nature Neuroscience, vol. 17, No. 11, pp. 1574-82, November 2014 www.nature.com/neuro Summary and review of the above paper INTRODUCTION: In a very guarded fashion, the authors of this paper cast doubt on the Libet-based orthodoxy where pre-conscious activity in the brain precludes the possibility of conscious will. Their research suggests that a simple threshold Read more […]

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Orbitofrontal encoding regret

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The orbitofrontal cortex and ventral striatum encode expected outcomes during decision taking. Activity in these brain regions also reflects the perception of missed opportunities. Neural signals related to regret at missed opportunities are encoded here.

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Brain areas involved with consciousness

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Even at the very early stage of the retina, an important division arises between two parallel visual streams, the dorsal stream and the ventral stream. The dorsal stream projects to the parietal cortex, and is responsible for movements in relation to objects, many of them of a routine or reflex nature. It is also seen as an answer to the ‘where is it?’ location question. The processing of the dorsal is unconscious, and is faster than the consciousness-related processing of the ventral stream.

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Perception, action, consciousness

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Perception, Action and Consciousness (Chapter 1) N. Gangopadhyay, M. Madary, & F. Spicer Oxford University Press (2010) This book sets out to discuss a debate within the cognitive sciences as to the relationship of perception and action. One view is that this involves on a dual visual system driving the mainly separate functioning of perception and action. The alternative proposal is a system in which the sensory and motor systems are interactive with perception, and where consciousness Read more […]

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Systems for perception and action

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Cortical visual systems for perception and action David Milner & Melvyn Goodale, University of Durham and University of Western Ontario In:- Perception, Action and Consciousness – Eds. Gangopadhyay, N., Madary, M. & Spicer, F. Keywords:  ventral stream, dorsal stream, Milner & Goodale, Aglioti, Biegstraaten The authors had previously proposed a model in which there are distinct paths for vision for perception and vision for action. This involves to pathways the ventral Read more […]

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Eagleman, the orbitofrontal and Libet

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Incognito David Eagleman This book represents a fairly standard exploration of the unconscious aspects of the mind, but in at least two areas it fails to fully explore its subject in the light of the most recent neuroscience. The function of the orbitofrontal region of the brain is presented here in a quasi-Freudian style, in which some automated process in the orbitofrontal represses urges towards various undesirable behaviour, which emerge as soon as the orbitofrontal is compromised.  Read more […]

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Dynamic coordination in the brain

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Coordination in Circuits Mayank Mehta et al In:- Dynamic Coordination in the Brain – Eds. Christoph von der Malsburg, William A. Phillips, & Wolf Singer This chapter examines aspects of neural synchronies, compression of information in relation to neuron oscillations, and the gamma synchronies involvement in communication between neural assemblies in different areas of the brain. All layers of the cortex have a variety of inhibitory interneurons using the GABA neurotransmitter. Read more […]

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Coordination in brain systems

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Coordination in brain systems Moser, E. I. et al In:- Dynamic Coordination in the Brain: From Neurons to Mind – Eds. Christoph von der Malsburg, William Phillips & Wolf Singer Neuroimaging of the human brain indicates coordination of activity between different brain regions. Large scale coordination is shown to span the entire brain.  Rhythmic modulation of electrical activity is seen as a possible mechanism to change the couplings amongst neurons. Networks undergoing electrical oscillation Read more […]

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Coordination in brain systems

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Coordination in brain systems Moser, E. I. et al In:- Dynamic Coordination in the Brain: From Neurons to Mind – Eds. Christoph von der Malsburg, William Phillips & Wolf Singer Neuroimaging of the human brain indicates coordination of activity between different brain regions. Large scale coordination is shown to span the entire brain.  Rhythmic modulation of electrical activity is seen as a possible mechanism to change the couplings amongst neurons. Networks undergoing electrical oscillation Read more […]

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