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The authors recorded from V1 cells in macaques required to saccade from a central fixation point to a target dot at the end of a curved line originating at fixation (a distractor dot appeared at the end of an additional curve that sometimes intersected the target curve). The results revealed enhanced firing rates in those cells whose receptive fields overlapped the curve connecting the target to fixation; simultaneous recording from multiple cells on different parts of the curve revealed that the onset of these enhanced firing rates occurred at the same time across all of the probed positions, suggesting that object-based attention facilitated processing of all portions of the curve simultaneously (as opposed to spreading along the curve from fixation to target)
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Roelfsema P.R., Lamme V.A.F., Spekreijse H. Object-based attention in the primary visual cortex of the macaque monkey. Nature. 395:1998;376-381. The authors recorded from V1 cells in macaques required to saccade from a central fixation point to a target dot at the end of a curved line originating at fixation (a distractor dot appeared at the end of an additional curve that sometimes intersected the target curve). The results revealed enhanced firing rates in those cells whose receptive fields overlapped the curve connecting the target to fixation; simultaneous recording from multiple cells on different parts of the curve revealed that the onset of these enhanced firing rates occurred at the same time across all of the probed positions, suggesting that object-based attention facilitated processing of all portions of the curve simultaneously (as opposed to spreading along the curve from fixation to target).
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(1998)
Nature
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, pp. 376-381
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Roelfsema, P.R.1
Lamme, V.A.F.2
Spekreijse, H.3
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47
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0031882838
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Switching attention without shifting the spotlight: Object-based attentional modulation of brain potentials
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The authors recorded ERP activity while subjects viewed displays of different coloured dots moving in the same circular path (in which case they appeared as part of the same surface) or opposite circular paths (in which case they appeared as part of two overlapping surfaces); subjects were instructed to report the occurrence of sudden angular movements of dots in one of the two colours. When displays appeared to contain two surfaces, angular movements of dots in the nontarget colour were associated with suppressed P1 and N1 ERP waveforms (showing surface-based attention in the absence of spatially separated stimuli); when displays appeared to contain a single surface nontarget dot, movements evoked a later selection negativity
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Valdes-Sosa M., Bobes M.A., Rodriguez V., Pinilla T. Switching attention without shifting the spotlight: object-based attentional modulation of brain potentials. J Cogn Neurosci. 10:1998;137-151. The authors recorded ERP activity while subjects viewed displays of different coloured dots moving in the same circular path (in which case they appeared as part of the same surface) or opposite circular paths (in which case they appeared as part of two overlapping surfaces); subjects were instructed to report the occurrence of sudden angular movements of dots in one of the two colours. When displays appeared to contain two surfaces, angular movements of dots in the nontarget colour were associated with suppressed P1 and N1 ERP waveforms (showing surface-based attention in the absence of spatially separated stimuli); when displays appeared to contain a single surface nontarget dot, movements evoked a later selection negativity.
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(1998)
J Cogn Neurosci
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Valdes-Sosa, M.1
Bobes, M.A.2
Rodriguez, V.3
Pinilla, T.4
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48
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0031057458
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Selective processing of superimposed objects: An electrophysiological analysis of object-based attentional selection
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The authors made ERP recordings while subjects reported the presence or absence of a pair of attributes (a colour and a shape) in displays consisting of two overlapping line drawings; probe dots occasionally appeared subsequent to the removal of these displays. Data revealed enhanced ERP waveforms indicative of early, space-based attention when both objects contained a target attribute (larger N1) as well as when probe dots appeared in locations previously occupied by objects containing both target attributes (larger P1)
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Weber T.A., Kramer A.F., Miller G.A. Selective processing of superimposed objects: an electrophysiological analysis of object-based attentional selection. Biol Psychol. 45:1997;159-182. The authors made ERP recordings while subjects reported the presence or absence of a pair of attributes (a colour and a shape) in displays consisting of two overlapping line drawings; probe dots occasionally appeared subsequent to the removal of these displays. Data revealed enhanced ERP waveforms indicative of early, space-based attention when both objects contained a target attribute (larger N1) as well as when probe dots appeared in locations previously occupied by objects containing both target attributes (larger P1).
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(1997)
Biol Psychol
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Weber, T.A.1
Kramer, A.F.2
Miller, G.A.3
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49
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0030814827
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Space-based and object-based visual attention: Shared and specific neural domains
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The authors recorded PET activity while subjects performed either an object-based or space-based location judgement. There was significant overlap between areas activated in both tasks (left and right medial and lateral parietal cortex, left prefrontal cortex); however, subjects also showed increased activity in the left occipital lobe and the striate and prestriate cortex during the object-based task, and right inferior temporal, fusiform gyrus, and right dorsolateral prefrontal during the space-based task. These findings suggest both commonality and specificity associated with selection of locations and objects
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Fink G.R., Dolan R.J., Halligan P.W., Marshall J.C., Frith C.D. Space-based and object-based visual attention: shared and specific neural domains. Brain. 120:1997;2013-2028. The authors recorded PET activity while subjects performed either an object-based or space-based location judgement. There was significant overlap between areas activated in both tasks (left and right medial and lateral parietal cortex, left prefrontal cortex); however, subjects also showed increased activity in the left occipital lobe and the striate and prestriate cortex during the object-based task, and right inferior temporal, fusiform gyrus, and right dorsolateral prefrontal during the space-based task. These findings suggest both commonality and specificity associated with selection of locations and objects.
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(1997)
Brain
, vol.120
, pp. 2013-2028
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Fink, G.R.1
Dolan, R.J.2
Halligan, P.W.3
Marshall, J.C.4
Frith, C.D.5
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50
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Grouping and extinction: Evidence for low-level modulation of visual selection
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Gilchrist I.D., Humphreys G.W., Riddoch M.J. Grouping and extinction: evidence for low-level modulation of visual selection. Cogn Neuropsychol. 13:1996;1223-1249.
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Cogn Neuropsychol
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Gilchrist, I.D.1
Humphreys, G.W.2
Riddoch, M.J.3
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51
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0030972613
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Visual extinction and prior entry: Impaired perception of temporal order with intact motion perception after unilateral parietal damage
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Rorden C., Mattingley J.B., Karnath H.-O., Driver J. Visual extinction and prior entry: impaired perception of temporal order with intact motion perception after unilateral parietal damage. Neuropsychologia. 35:1997;421-433.
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Neuropsychologia
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Rorden, C.1
Mattingley, J.B.2
Karnath, H.-O.3
Driver, J.4
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52
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0031038780
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Pre-attentive filling in of visual surfaces in parietal extinction
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A patient with right parietal damage was better at detecting bilateral changes to 'Pac-men' stimuli when items formed an illusory square than when they did not. This suggests that pre-attentive construction of illusory contours aided in the amelioration of extinction by grouping contralesional items with ipsilesional items
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Mattingley J.B., David G., Driver J. Pre-attentive filling in of visual surfaces in parietal extinction. Science. 275:1997;671-674. A patient with right parietal damage was better at detecting bilateral changes to 'Pac-men' stimuli when items formed an illusory square than when they did not. This suggests that pre-attentive construction of illusory contours aided in the amelioration of extinction by grouping contralesional items with ipsilesional items.
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(1997)
Science
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Mattingley, J.B.1
David, G.2
Driver, J.3
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53
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Perceptual and conceptual factors in neglect dyslexia: Two contrasting case studies
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Behrmann M., Moscovitch M., Black S.E., Mozer M. Perceptual and conceptual factors in neglect dyslexia: two contrasting case studies. Brain. 113:1990;1163-1883.
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Brain
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Behrmann, M.1
Moscovitch, M.2
Black, S.E.3
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Preserved figure-ground segregation and symmetry perception in visual neglect
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Driver J., Baylis G.C., Rafal R.D. Preserved figure-ground segregation and symmetry perception in visual neglect. Nature. 360:1992;73-75.
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Nature
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Driver, J.1
Baylis, G.C.2
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Grouping reduces visual extinction: Neuropsychological evidence for weight-linkage in visual selection
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Ward R., Goodrich S., Driver J. Grouping reduces visual extinction: neuropsychological evidence for weight-linkage in visual selection. Vis Cogn. 1:1994;101-129.
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Ward, R.1
Goodrich, S.2
Driver, J.3
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0003103193
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Computational modeling of spatial attention
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H. Pashler. East Sussex: Psychology Press
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Mozer M.C., Sitton M. Computational modeling of spatial attention. Pashler H Attention. 1998;341-395 Psychology Press, East Sussex.
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Attention
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Mozer, M.C.1
Sitton, M.2
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Spatial representation in the brain: Neuropsychological and computational constraints
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Humphreys G.W., Heinke D. Spatial representation in the brain: neuropsychological and computational constraints. Vis Cogn. 5:1998;9-47.
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Humphreys, G.W.1
Heinke, D.2
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58
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0031590432
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A new view of hemineglect based on the response properties of parietal neurones
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The major focus of these simulations is the representation of space using mathematical basis functions (roughly analogous to dimensions or co-ordinates) of sensory inputs. A saliency value assigned to the inputs, however, determines selection, and once a position is selected, its saliency is subsequently set to zero (and return to it is inhibited). A range of data from patients with parietal lesions is simulated under these computational conditions. Use of basis functions provides an explanation of how multiple attentional deficits can be evoked by a single lesion to a neural network
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Pouget A., Sejnowski T.J. A new view of hemineglect based on the response properties of parietal neurones. Philos Trans R Soc [Lond]. 352:1997;1449-1459. The major focus of these simulations is the representation of space using mathematical basis functions (roughly analogous to dimensions or co-ordinates) of sensory inputs. A saliency value assigned to the inputs, however, determines selection, and once a position is selected, its saliency is subsequently set to zero (and return to it is inhibited). A range of data from patients with parietal lesions is simulated under these computational conditions. Use of basis functions provides an explanation of how multiple attentional deficits can be evoked by a single lesion to a neural network.
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(1997)
Philos Trans R Soc [Lond]
, vol.352
, pp. 1449-1459
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Pouget, A.1
Sejnowski, T.J.2
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