| Publication |
Sentence |
Publish Date |
Extraction Date |
Species |
| S Grossberg, J R Williamso. A neural model of how horizontal and interlaminar connections of visual cortex develop into adult circuits that carry out perceptual grouping and learning. Cerebral cortex (New York, N.Y. : 1991). vol 11. issue 1. 2001-03-01. PMID:11113034. |
the on-center, off-surround layer 6-to-4 circuit enables top-down attentional signals from area v2 to modulate, or attentionally prime, layer 4 cells in area v1 without fully activating them. |
2001-03-01 |
2023-08-12 |
Not clear |
| W D Ross, S Grossberg, E Mingoll. Visual cortical mechanisms of perceptual grouping: interacting layers, networks, columns, and maps. Neural networks : the official journal of the International Neural Network Society. vol 13. issue 6. 2001-01-18. PMID:10987511. |
layer 6 in v1 also sends top-down signals to lgn using an on-center off-surround network, which suppresses lgn cells that do not receive feedback, while selecting, enhancing, and synchronizing activity of those that do. |
2001-01-18 |
2023-08-12 |
Not clear |
| S Kastner, L G Ungerleide. Mechanisms of visual attention in the human cortex. Annual review of neuroscience. vol 23. 2000-09-08. PMID:10845067. |
the competition among multiple objects in visual cortex can be biased by both bottom-up sensory-driven mechanisms and top-down influences, such as selective attention. |
2000-09-08 |
2023-08-12 |
human |
| S Kastner, L G Ungerleide. Mechanisms of visual attention in the human cortex. Annual review of neuroscience. vol 23. 2000-09-08. PMID:10845067. |
although the competition among stimuli for representation is ultimately resolved within visual cortex, the source of top-down biasing signals derives from a network of areas in frontal and parietal cortex. |
2000-09-08 |
2023-08-12 |
human |
| S Grossber. How hallucinations may arise from brain mechanisms of learning, attention, and volition. Journal of the International Neuropsychological Society : JINS. vol 6. issue 5. 2000-08-29. PMID:10932478. |
the article predicts where these top-down expectations and volitional signals may act in the laminar circuits of visual cortex and, by extension, in other sensory and cognitive neocortical areas, and how the level of abstractness of learned prototypes may covary with the abstractness of hallucinatory content. |
2000-08-29 |
2023-08-12 |
Not clear |
| C Gilbert, M Ito, M Kapadia, G Westheime. Interactions between attention, context and learning in primary visual cortex. Vision research. vol 40. issue 10-12. 2000-08-04. PMID:10788637. |
v1 is therefore a dynamic and active processor, subject to top-down influences. |
2000-08-04 |
2023-08-12 |
human |
| C Bernasconi, A von Stein, C Chiang, P Köni. Bi-directional interactions between visual areas in the awake behaving cat. Neuroreport. vol 11. issue 4. 2000-06-05. PMID:10757501. |
here we investigated the relative contributions of top-down and bottom-up directed interactions between area 17 and area 7 of the cat visual system. |
2000-06-05 |
2023-08-12 |
cat |
| G A Patel, K Sathia. Visual search: bottom-up or top-down? Frontiers in bioscience : a journal and virtual library. vol 5. 2000-05-12. PMID:10702378. |
the conjunction of bottom-up processing with top-down attentional suppression of an irrelevant singleton could account for activity found in right primary visual cortex (v1). |
2000-05-12 |
2023-08-12 |
human |
| R Yuste, M Su. Development and plasticity of the cerebral cortex: from molecules to maps. Journal of neurobiology. vol 41. issue 1. 1999-11-10. PMID:10504185. |
a particularly interesting recent example of the role of top-down vs. bottom-up influences in the development of cortical connections is the emergence of orientation selectivity in visual cortex: we propose a synthetic view highlighting the role of the thalamo-cortical reciprocal projection in this process. |
1999-11-10 |
2023-08-12 |
human |
| V M Monter. Amblyopia decreases activation of the corticogeniculate pathway and visual thalamic reticularis in attentive rats: a 'focal attention' hypothesis. Neuroscience. vol 91. issue 3. 1999-10-08. PMID:10391464. |
mechanistically, a focus of animal's attention is transmitted in a top-down fashion from the extrastriate cortex, and from upper cortical layers, into striate cortex layer 6. |
1999-10-08 |
2023-08-12 |
rat |
| S Kastner, M A Pinsk, P De Weerd, R Desimone, L G Ungerleide. Increased activity in human visual cortex during directed attention in the absence of visual stimulation. Neuron. vol 22. issue 4. 1999-05-19. PMID:10230795. |
the increased activity in visual cortex in the absence of visual stimulation may reflect a top-down bias of neural signals in favor of the attended location, which derives from a fronto-parietal network. |
1999-05-19 |
2023-08-12 |
human |
| J M Bud. Extrastriate feedback to primary visual cortex in primates: a quantitative analysis of connectivity. Proceedings. Biological sciences. vol 265. issue 1400. 1998-08-11. PMID:9675911. |
knowledge-based or top-down influences on primary visual cortex (area v1) are believed to originate from information conveyed by extrastriate feedback axon connections. |
1998-08-11 |
2023-08-12 |
rat |
| R R Johnson, A Burkhalte. A polysynaptic feedback circuit in rat visual cortex. The Journal of neuroscience : the official journal of the Society for Neuroscience. vol 17. issue 18. 1997-10-03. PMID:9278547. |
feedback connections from extrastriate cortex to primary visual cortex (v1) in the primate may provide "top-down" information that plays a role in visual attention and object recognition. |
1997-10-03 |
2023-08-12 |
rat |
| R R Johnson, A Burkhalte. A polysynaptic feedback circuit in rat visual cortex. The Journal of neuroscience : the official journal of the Society for Neuroscience. vol 17. issue 18. 1997-10-03. PMID:9278547. |
the function of these excitatory networks within v1 may be to amplify feedback activity and provide a circuit for modulation of striate cortical activity by top-down influences. |
1997-10-03 |
2023-08-12 |
rat |
| G L Shulman, M Corbetta, R L Buckner, M E Raichle, J A Fiez, F M Miezin, S E Peterse. Top-down modulation of early sensory cortex. Cerebral cortex (New York, N.Y. : 1991). vol 7. issue 3. 1997-06-04. PMID:9143441. |
significant modulation of medial visual regions was observed in six of nine studies, indicating that top-down processes can affect early visual cortex. |
1997-06-04 |
2023-08-12 |
human |
| M Ahissar, S Hochstei. Learning pop-out detection: specificities to stimulus characteristics. Vision research. vol 36. issue 21. 1997-01-21. PMID:8977015. |
we suggest that the site of early perceptual learning is one of the cortical areas which receive input from primary visual cortex, v1, and where top-down attentional control is present. |
1997-01-21 |
2023-08-12 |
Not clear |