This study tested for spatial orienting effects, without awareness, to signals presented in the neglected hemifield of 2 hemispatialneglect patients. The experiment adapted a spatial precuing paradigm for measuring the effects of visual attention. Contralesional orienting hastened subsequent target detection at the location of an extinguished precue. These findings validate a claim that orienting can occur independently of overt detection and indicate that location information is registered in the neglected field.
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References
1.
AlbertsM.L. (1973). A simple test of visual neglect. Neurology, 23, 658–664.
2.
CohenA.IvryR.B.RafalR.D.KohnK. (1995). Activating response codes by stimuli in the neglected field. Neuropsychology, 9, 165–173.
3.
KnightR.T.ScabiniD.WoodsD.L.ClayworthC. (1988). The effects of lesions of superior temporal gyrus and the inferior parietal lobe on temporal and vertex components of the AEP. Encephalography and Clinical Neurophysiology, 70, 499–509.
4.
KramerA.F.HahnS. (1995). Splitting the beam: Distribution of attention over noncontiguous regions of the visual field. Psychological Science, 6, 381–386.
5.
MesulamM.M. (1981). A cortical network for directed attention and unilateral neglect. Annals of Neurology, 10, 309–325.
6.
PosnerM.I. (1980). Orienting of attention. Quarterly Journal of Experimental Psychology, 32, 3–25.
7.
PosnerM.I.CohenY.P.C. (1984). Components of visual orienting. In BoumaH.BouwhuisD., (Eds.), Attention and performance X (pp. 531–556). London: Erlbaum.
8.
PosnerM.I.DavidsonB.J.SnyderC.R.R. (1980). Attention and the detection of signals. Journal of Experimental Psychology: General, 109, 160–174.
9.
PosnerM.I.PetersenS.E. (1990). The attention system of the human brain. Annual Review of Neuroscience, 13, 25–42.
10.
PosnerM.I.PetersenS.E.FoxP.T.RaichleM.E. (1988). Localization of cognitive operations in the human brain. Science, 240, 1627–1631.
11.
PosnerM.I.RothbartM.K. (1992). Attention mechanisms and conscious experience. In MilnerD.A.RuggM.D., (Eds.), The neuropsychology of consciousness (pp. 91–111). London: Academic Press.
12.
PosnerM.I.WalkerJ.A.FriedrichF.J.RafalR.D. (1984). Effects of parietal injury on covert orienting of visual attention. Journal of Neuroscience, 4, 1863–1874.
13.
YantisS.JohnsonD.N. (1990). Mechanisms of attentional priority. Journal of Experimental Psychology: Human Perception and Performance, 16, 812–825.
