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ARTICLE

Where and When to Pay Attention: The Neural Systems for Directing Attention to Spatial Locations and to Time Intervals as Revealed by Both PET and fMRI

Jennifer T. Coull and Anna C. Nobre
Journal of Neuroscience 15 September 1998, 18 (18) 7426-7435; DOI: https://doi.org/10.1523/JNEUROSCI.18-18-07426.1998
Jennifer T. Coull
1Functional Imaging Laboratory, Wellcome Department of Cognitive Neurology, Institute of Neurology, London WC1N 3BG, United Kingdom, and
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Anna C. Nobre
1Functional Imaging Laboratory, Wellcome Department of Cognitive Neurology, Institute of Neurology, London WC1N 3BG, United Kingdom, and
2University of Oxford, Department of Experimental Psychology, Oxford OX1 3UD, United Kingdom
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Abstract

Although attention is distributed across time as well as space, the temporal allocation of attention has been less well researched than its spatial counterpart. A temporal analog of the covert spatial orientation task [Posner MI, Snyder CRR, Davidson BJ (1980) Attention and the detection of signals. J Exp Psychol Gen 109:160–174] was developed to compare the neural systems involved in directing attention to spatial locations versus time intervals. We asked whether there exists a general system for allocating attentional resources, independent of stimulus dimension, or whether functionally specialized brain regions are recruited for directing attention toward spatial versus temporal aspects of the environment. We measured brain activity in seven healthy volunteers by using positron emission tomography (PET) and in eight healthy volunteers by using functional magnetic resonance imaging (fMRI). The task manipulated cued attention to spatial locations (S) and temporal intervals (T) in a factorial design. Symbolic central cues oriented subjects toward S only (left or right), toward T only (300 msec or 1500 msec), toward both S and T simultaneously, or provided no information regarding S or T. Subjects also were scanned during a resting baseline condition. Behavioral data showed benefits and costs for performance during temporal attention similar to those established for spatial attention. Brain-imaging data revealed a partial overlap between neural systems involved in the performance of spatial versus temporal orientation of attention tasks. Additionally, hemispheric asymmetries revealed preferential right and left parietal activation for spatial and temporal attention, respectively. Parietal cortex was activated bilaterally by attending to both dimensions simultaneously. This is the first direct comparison of the neural correlates of attending to spatial versus temporal cues.

  • attention
  • space
  • time
  • orienting
  • parietal
  • lateralization
  • imaging
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The Journal of Neuroscience: 18 (18)
Journal of Neuroscience
Vol. 18, Issue 18
15 Sep 1998
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Where and When to Pay Attention: The Neural Systems for Directing Attention to Spatial Locations and to Time Intervals as Revealed by Both PET and fMRI
Jennifer T. Coull, Anna C. Nobre
Journal of Neuroscience 15 September 1998, 18 (18) 7426-7435; DOI: 10.1523/JNEUROSCI.18-18-07426.1998

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Where and When to Pay Attention: The Neural Systems for Directing Attention to Spatial Locations and to Time Intervals as Revealed by Both PET and fMRI
Jennifer T. Coull, Anna C. Nobre
Journal of Neuroscience 15 September 1998, 18 (18) 7426-7435; DOI: 10.1523/JNEUROSCI.18-18-07426.1998
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Keywords

  • attention
  • space
  • time
  • orienting
  • parietal
  • lateralization
  • imaging

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