Author: W. Sturm
Perception and Attention Functions - Long Test

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The test combination Perception and Attention Functions - Long Test (WAF-LT) measures fundamental subfunctions of attention and corresponds to the standard testing (long form) of the WAF VTS tests.

Attention performances are important for the successful handling of the tasks that the individual encounters in daily life. They are not independent of other skills but are a constituent of many processes of perception, memory, planning and acting, spatial orientation and problem-solving. Attention functions are thus basic skills that are required in almost every practical or intellectual activity. Many neurological and psychological disorders and diseases have an adverse effect on different aspects of attention performance. The WAF tests, which are model and guideline compliant (GNP), are therefore mainly used in the context of clinical neuropsychological investigations since they allow for both a global and a differentiated assessment of an individual’s strengths and weaknesses. They are also used for personnel selection (especially in the field of manufacturing & safety assessments) and for traffic psychological investigations. 

The WAF-LT test combination includes a subtest from each dimension of the attention model underlying the WAF. This is meant to be able to measure and investigate attention as broadly as possible. The test combination includes subtests for measuring intrinsic and cross-modal phasic alertness, unimodal focused and unimodal selective attention, cross-modal divided attention, controlled spatial attention, vigilance, visual scanning and smooth pursuit eye movements and the investigation of resilience to fatigue (retesting) for intrinsic alertness.


English (USA)



The subtests of the WAF fulfill the requirements for content and construct validity. Since all subtests contained in WAF are measured using common and widely used paradigms, content validity is given. Construct validity can be confirmed via the analysis of discriminant and convergent validities with construct-related and construct-unrelated tests. In addition, confirmatory factor analyses prove the factor structure based on different samples corresponding to common attentional models.

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Controlled Mode

Dimensions of attention
DimensionsTestsTest formsDuration in min.
Total duration84 minutes
Intrinsic alertness (visual)WAFS12
Cross-modal phasic alertness (visual)WAFS12
Focused attention
Unimodal focused attention (auditory)WAFS110
Divided attention
Cross-modal divided attention (visual/auditory)WAFS16
Spatial attention
Controlled spatial attentionWAFS112
Selective attention
Unimodal selective attentionWAFS18
Vigilance (visual)WAFS132
Visual search
Visual scanningWAFS17
Smooth pursuit eye movementsWAFS13
Intrinsic alertness (visual) – retestingWAFS12

The scoring of the WAF-LT test combination corresponds to the individual scoring of the WAF VTS tests and includes the possibility for norm adjustment as well as scoring follow-up assessments in addition to reporting the main and subsidiary variables. The following main variables are scored, depending on the subtest:

  • A main variable with the name of the ability it measures is available for each dimension. These variables are a logarithmic mean of the individual reaction times for tasks for alertness, focused attention, divided attention, selective attention, spatial attention, vigilance or visual search.
  • Dispersion of reaction time: Measure of the variability of attention.
  • Different error types: Measure for sustaining the corresponding attention function.

Additional information:

  • Dimension-specific indices: Measure of the corresponding attention function.
  • Norm adjustment: The impact of age, gender, and education is automatically considered in the scoring.
  • Display and scoring of follow-up assessments in a compact overview.
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Products specifications
LanguagesEnglish (USA), German
Test informationsupervisor-supported testing <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="The supervisor describes the tasks verbally. A sample task is then presented. This promotes interaction between the supervisor and respondent."></i>, cross-test norming <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="The entire test set has been administered to a representative sample. This yields cross-test norms."></i>, cross-test validation <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="The practical value of the test set has been demonstrated in at least one validation study."></i>, cross-test scoring <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="In addition to the results of the individual tests or test dimensions, a cross-test score, such as a FIT score, is also reported. This enables general test performance to be rapidly interpreted."></i>, additional device required <i class="fas fa-info-circle tooltips test-info" data-container="body" data-placement="top" data-toggle="tooltip" title="A SCHUHFRIED peripheral device (e.g. a Response Panel) is needed for proper administration of the test."></i>