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Results IVA shows no difference between learning disabled & normal controls No effect of NF. Test-Retest Reliability of the Lateralized Attention Network Test Deanna Greene 1 , Kristin Herzberg 1 , Anat Barnea 2, , Amir Raz 3 , & Eran Zaidel 1

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slide1

Results

IVA shows no difference between learning disabled & normal controls

No effect of NF

  • Test-Retest Reliability of the Lateralized Attention Network Test
  • Deanna Greene1, Kristin Herzberg1, Anat Barnea2,, Amir Raz3, & Eran Zaidel1
      • 1Department of Psychology, University of California at Los Angeles, CA, USA; 2Bio-Keshev Center, Kibutz Givat Chaim Ichud, Israel;
      • 3Department of Psychiatry, College of Physicians and Surgeons, Columbia University, New York, NY, USA;
  • Introduction
  • Attention can be viewed as a system of three separate and independent networks: Conflict resolution, spatial Orienting, and Alerting.
  • Posner and associates devised a test to measure the three attention networks: the Attention Network Test (ANT).
  • We developed an adaptation of the ANT to measure the networks separately within each hemisphere: the Lateralized Attention Network Test (LANT).
  • We ran four versions of the LANT on a population of normal young adults and have assessed the test-retest reliability of the task.
  • Definitions:
  • Conflict: C = Reaction time (RT) for trials with Incongruent flankers minus RT for trials with Congruent flankers
  • Orienting: O = RT for trials with Invalid cues minus RT for trials with Valid cues
    • Orienting Benefit: OB = Center cues minus Valid cues

Orienting Cost: OC = Invalid cues minus Center cues

  • Alerting: A = RT for trials with No cues minus RT for trials with Double cues

‘+’ = significantly reliable

‘--’ = did not reach significance

Reliabilty

Versions

LANT:

• Presented tachistoscopically for 170ms to the left visual field (LVF) or right visual field (RVF)

• Target: middle arrow pointing up/down. (see figure)

• Flanker arrows: Congruent- same direction as target

Incongruent- opposite direction as target

Neutral- straight lines

Methods

Results

Estimates of attention networks

Conclusions

Version 2 (small target) yields the best reliability of the attention networks overall and within each hemisphere.

2.Even in the best version, reliability was not high. Therefore, the LANT is not a preferred measure for individual clinical assessment.

3. Version 2 yields significant estimates of all networks, and it has good power for measuring group data in studying hemispheric attention.

LVF

Congruent flankers Incongruent flankers Neutral flankers

in RVF in LVF in LVF

• Target preceded by 1 of 5 possible cues:

Center- asterisk at central fixation

Double- asterisk on both sides of central fixation

Valid- asterisk on the side in which the target will appear

Invalid- asterisk on the opposite side from which the target will

appear

No cue

RVF

  • References
  • Posner, M. I., & Raichle, M. E. (1994). Images of mind. New York: Scientific American Library.
  • Fan J., McCandliss B.D., Sommer T., Raz A., & Posner M.I. (2002). Testing the efficiency and independence of attentional networks. Journal of Cognitive Neuroscience, 3, 340-347.
  • Barnea A., Rassis A., Raz A., Neta Maital., & Zaidel Z., (in preparation) The Lateralized Attention Network Test (LANT).
  • Barnea A., Rassis A., Neta M., Raz A. and Zaidel, E. (2004). The Lateralized Attention Network Test (LANT) in Children and Adults. Abstract. TENNET, Montreal Canada.

Center cue Double cue Valid/ Invalid cue