It is not clear whether the method used in functional brain-network related research can be applied to explore the feature binding mechanism of visual perception. In this study, we inves-tigated feature binding of col...It is not clear whether the method used in functional brain-network related research can be applied to explore the feature binding mechanism of visual perception. In this study, we inves-tigated feature binding of color and shape in visual perception. Functional magnetic resonance imaging data were collected from 38 healthy volunteers at rest and while performing a visual perception task to construct brain networks active during resting and task states. Results showed that brain regions involved in visual information processing were obviously activated during the task. The components were partitioned using a greedy algorithm, indicating the visual network existed during the resting state.Z-values in the vision-related brain regions were calculated, conifrming the dynamic balance of the brain network. Connectivity between brain regions was determined, and the result showed that occipital and lingual gyri were stable brain regions in the visual system network, the parietal lobe played a very important role in the binding process of color features and shape features, and the fusiform and inferior temporal gyri were crucial for processing color and shape information. Experimental ifndings indicate that understanding visual feature binding and cognitive processes will help establish computational models of vision, improve image recognition technology, and provide a new theoretical mechanism for feature binding in visual perception.展开更多
Introduction:This paper describes the leafing,flowering and fruiting phenology of canopy trees in the dry deciduous forest of Bhadra wildlife sanctuary from June 2004 to May 2006.Method:All the woody canopy individual...Introduction:This paper describes the leafing,flowering and fruiting phenology of canopy trees in the dry deciduous forest of Bhadra wildlife sanctuary from June 2004 to May 2006.Method:All the woody canopy individuals(>20 cm girth at breast height)were identified and tagged with a unique number along a transect of approximately 2 Km comprising 157 individuals of 22 species.Observations were made at monthly intervals from June 2004 to May 2006 for leafing,flowering and fruiting phenophases.Result:Leaf fall starts in September,with a peak in December and January.Leaf initiation begins in February,with a peak in April before the monsoon.Leaf expansion starts in February from pre-monsoon with a peak in May and July during the monsoon.Leaf senescence begins in September to November and peaks in January to March.Flower bud initiates in January with a peak in April and May,and pollination begins in April with a peak in May and July before the monsoon to onset of monsoon.Fruit bud initiates in May with a peak in September and October.Unripened fruit was observed in May with a peak in September and November.Fruit fall begins in November with a peak in March.Conclusion:Our results show that leafing and flowering activities occur in the summer or pre-monsoon.Fruiting patterns occur during the monsoon to post-monsoon season.Seasonality among various phenophases indicates that leaf senescence flower initiation and fruit fall have strong seasonality.展开更多
基金financially supported by grants from the National Natural Science Foundation of China,No.61170136,61373101,61472270,and 61402318Natural Science Foundation(Youth Science and Technology Research Foundation)of Shanxi Province,No.2014021022-5Shanxi Provincial Key Science and Technology Projects(Agriculture),No.20130311037-4
文摘It is not clear whether the method used in functional brain-network related research can be applied to explore the feature binding mechanism of visual perception. In this study, we inves-tigated feature binding of color and shape in visual perception. Functional magnetic resonance imaging data were collected from 38 healthy volunteers at rest and while performing a visual perception task to construct brain networks active during resting and task states. Results showed that brain regions involved in visual information processing were obviously activated during the task. The components were partitioned using a greedy algorithm, indicating the visual network existed during the resting state.Z-values in the vision-related brain regions were calculated, conifrming the dynamic balance of the brain network. Connectivity between brain regions was determined, and the result showed that occipital and lingual gyri were stable brain regions in the visual system network, the parietal lobe played a very important role in the binding process of color features and shape features, and the fusiform and inferior temporal gyri were crucial for processing color and shape information. Experimental ifndings indicate that understanding visual feature binding and cognitive processes will help establish computational models of vision, improve image recognition technology, and provide a new theoretical mechanism for feature binding in visual perception.
文摘Introduction:This paper describes the leafing,flowering and fruiting phenology of canopy trees in the dry deciduous forest of Bhadra wildlife sanctuary from June 2004 to May 2006.Method:All the woody canopy individuals(>20 cm girth at breast height)were identified and tagged with a unique number along a transect of approximately 2 Km comprising 157 individuals of 22 species.Observations were made at monthly intervals from June 2004 to May 2006 for leafing,flowering and fruiting phenophases.Result:Leaf fall starts in September,with a peak in December and January.Leaf initiation begins in February,with a peak in April before the monsoon.Leaf expansion starts in February from pre-monsoon with a peak in May and July during the monsoon.Leaf senescence begins in September to November and peaks in January to March.Flower bud initiates in January with a peak in April and May,and pollination begins in April with a peak in May and July before the monsoon to onset of monsoon.Fruit bud initiates in May with a peak in September and October.Unripened fruit was observed in May with a peak in September and November.Fruit fall begins in November with a peak in March.Conclusion:Our results show that leafing and flowering activities occur in the summer or pre-monsoon.Fruiting patterns occur during the monsoon to post-monsoon season.Seasonality among various phenophases indicates that leaf senescence flower initiation and fruit fall have strong seasonality.
