نتایج جستجو برای: area allocation

تعداد نتایج: 658730  

Journal: :Journal of neurophysiology 2007
Michael A Silver David Ress David J Heeger

Attention is thought to enhance perceptual performance at attended locations through top-down attention signals that modulate activity in visual cortex. Here, we show that activity in early visual cortex is sustained during maintenance of attention in the absence of visual stimulation. We used functional magnetic resonance imaging (fMRI) to measure activity in visual cortex while human subjects...

2012
Yaqing Niu Rebecca M. Todd A. K. Anderson

In natural vision both stimulus features and cognitive/affective factors influence an observer's attention. However, the relationship between stimulus-driven ("bottom-up") and cognitive/affective ("top-down") factors remains controversial: Can affective salience counteract strong visual stimulus signals and shift attention allocation irrespective of bottom-up features? Is there any difference b...

Journal: :Journal of vision 2007
Katharina Anton-Erxleben Christian Henrich Stefan Treue

Spatial attention shifts receptive fields in monkey extrastriate visual cortex toward the focus of attention (S. Ben Hamed, J. R. Duhamel, F. Bremmer, & W. Graf, 2002; C. E. Connor, J. L. Gallant, D. C. Preddie, & D. C. Van Essen, 1996; C. E. Connor, D. C. Preddie, J. L. Gallant, & D. C. Van Essen, 1997; T. Womelsdorf, K. Anton-Erxleben, F. Pieper, & S. Treue, 2006). This distortion in the reti...

Mortezavi, Morteza , Sheykh, Reza ,

Abstract: One of the main responsibilities of urban managers is to create justice in the area of fair and equal access of citizens to urban services. By objective realization of spatial justice concept, while providing the citizens with the appropriate services, the ground of reducing urban problems is prepared. Spatial justice is one of the main concepts of sustainable urban development. This ...

Journal: :Journal of experimental botany 2000
D A Grantz S Yang

O(3)could reduce growth and carbohydrate allocation to roots by direct inhibition of photosynthesis and source strength. Alternatively, O(3) could reduce growth indirectly by inhibition of root hydraulic development through a primary lesion in carbohydrate translocation. Another alternative is that O(3) could slow the rate of plant development, only apparently altering carbohydrate allocation a...

Journal: :BMC Public Health 2001
Norman Beale Gordon Taylor Dawn Straker-Cook

BACKGROUND Widespread scepticism persists on the use of the Under-Privileged Area (UPA8) score of Jarman in distributing supplementary resources to so-attributed 'deprived' UK general practices. The search for better 'needs' markers continues. Having already shown that Council Tax Valuation Band (CTVB) is a predictor of UK GP workload, we compare, here, CTVB of residence of a random sample of p...

Journal: :Cognitive, affective & behavioral neuroscience 2013
Naomi Vanlessen Valentina Rossi Rudi De Raedt Gilles Pourtois

Recent evidence has suggested that not only stimulus-specific attributes or top-down expectations can modulate attention selection processes, but also the actual mood state of the participant. In this study, we tested the prediction that the induction of positive mood can dynamically influence attention allocation and, in turn, modulate early stimulus sensory processing in primary visual cortex...

Journal: :Journal of human ergology 2006
Hiroshi Naito Toshiaki Miura Takahiko Kimura

We investigated how visual attentional resources are allocated during reaching movements. Particularly, this study examined whether or not the direction of the reaching movement affected visual attention resource allocation. Participants held a stylus pen to reach their hand toward a target stimulus on a graphics tablet as quickly and accurately as possible. The direction of the hand movement w...

2007
Bahador Bahrami Nilli Lavie Geraint Rees

Visual neuroscience has long sought to determine the extent to which stimulus-evoked activity in visual cortex depends on attention and awareness. Some influential theories of consciousness maintain that the allocation of attention is restricted to conscious representations [1, 2]. However, in the load theory of attention [3], competition between task-relevant and task-irrelevant stimuli for li...

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