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PERCEPTION AND ATTENTION FUNCTIONS: VISUAL-SPATIAL - WAFR - 7 YEAR LICENSE

Model 64132

Perception and Attention Functions: Visual-Spatial - WAFR - 7 Year License
 
   
 

DETAILS

SYSTEM OVERVIEW

The Schuhfried VTS enables computer-assisted application of a large number of highly diverse psycho-diagnostic tests and measuring procedures. In developing the system much emphasis was placed on transparent structure and largely uniform design. It is therefore simple to operate and easy to understand and does not require any special computer skills.

The VTS basic module is required for administration of any of the available tests.

The Schuhfried VTS supports the administration of both single tests and test batteries. Many of the single tests are available in different test versions. These test versions may differ, for example, in terms of test duration or difficulty or may be parallel forms. They are characterized by different parameters reflecting specific test requirements. They have been designed for administration to a specific population (e.g. psychiatric patients, children, etc.) or for special measuring purposes (e.g. repeated measurements). Test batteries are compiled from the available single tests and test versions.

OVERVIEW

On account of their theory-led construction basis the tests of the WAF battery can be used for the differentiated assessment of almost all the sub-functions of attention which are currently regarded as relevant.

APPLICATION

Assessment of sub-functions of attention, suitable for subjects from the age of 8.

Main areas of application: Neuropsychology; clinical psychology; health psychology; sport psychology; aviation psychology; performance and aptitude assessment; educational psychology; pharmacology.

THEORETICAL BACKGROUND

Modern views of the dimensionality of attention can be summarised by the model proposed by van Zomeren and Brouwer (1994). According to this model the central factors include the distinguishing of intensity and selectivity aspects of attention; these need to be differentiated into their more specific components. The intensity aspect of attention is made up of alertness and vigilance components which are basal processes of short-term and of longer-term attention activation or of the sustaining of this activation. With regard to the selectivity aspect of attention processes the model distinguishes between focused or selective attention and divided attention.

The spatial direction of attention is an additional, independent dimension that the above model does not at present take into account (Posner et al., 1978, 1984) but which is included in more recent taxonomies (Sturm 2005). Both Posner and Raichle (1994) and Fernandez-Duque and Posner (2001) distinguish three types of attention networks:

  • Orienting (corresponds to the network of spatial direction of attention),
  • Vigilance (corresponds to the intensity dimension) and
  • Executive Attention (corresponds to the selectivity dimension).

ADMINISTRATION

The WAF test battery consists of 6 tests that can be administered independently of each other or, as a test battery, in any desired combination: For each of the WAF tests different test forms are available, enabling dimensions of attention to be assessed under different presentation modalities. Thus the WAF tests systematically include sub-tests for visual, auditory and cross-modal presentation. In some subtests of the WAF test battery automated and controlled aspects of attention are measured separately; the stimuli either become more prominent because the intensity level is increased (popping out), or they become less prominent because their intensity is decreased and cognitively controlled top down processes are then required. Both attention processes are relevant in everyday life; both can interact and both can be selectively impaired, for example as a result of brain damage, since they are based on different cerebral networks (Corbetta & Schulman, 2002).

WAFR: The spatial direction of attention is measured using either 4 or 8 spatial positions in a task similar to a Posner paradigm. Peripheral (exogenous) and central (endogenous) spatial cues are used. In the neglect test stimuli are presented at various positions in the right or left visual field or simultane-ously in equivalent positions in both halves of the field of vision (extinction condition). one visual one and one auditory one. He has to monitor both channels to determine whether one of the stimuli occurs twice in succession.

SUBTESTS

Subtests with either 4 or 8 stimulus positions and peripheral or central cues. In addition a test for visual field / neglect under extinction conditions.

SCORING

In all WAF tests the reaction times and the various error types are scored. For most variables a norm comparison (percentile ranks and T scores) is also carried out.

RELIABILITY

Very good reliabilities – particularly in view of the short testing time – are obtained for the main variables of the WAF tests.

VALIDITY

A study of the tests' construct validity involving a sample of n=256 subjects provided empirical evidence of the theoretical model on which the WAF test battery is based and was able to distinguish it from other models.

NORMS

For all WAF tests norms representative of the general population are available; the norms relate to 295 individuals in the age range 16 - 77. The norms are available both for the sample as a whole and also separated according to educational level. In addition all WAF tests provide raw scores adjusted for age effects for the main variables. Work on enlarging the norm sample is currently in progress.

TESTING TIME

The time required to complete the individual WAF tests is relatively short. It is therefore possible to create batteries of tests for complex assessment purposes without requiring too much of the respondent in terms of time or motivational commitment. It is usually not necessary to administer each test in all stimulus modalities. The tests to be administered must be decided by the user, taking into account any information about a patient's difficulties or disabilities that has already been gathered. The test results can only be interpreted without qualification if the respondent / patient meets the sensory and motor requirements for satisfactory completion of the test. WAFR: approx. 5 mins. for each subtest.

ACCESSORIES

REQUIRED ACCESSORIES

Schuhfried Vienna Test System Image

Schuhfried Vienna Test System
Model 64032

The Schuhfried VTS enables computer-assisted application of a large number of highly diverse psycho-diagnostic tests and measuring procedures.

RELATED PRODUCTS

Perception and Attention Functions: Visual-Spatial - WAFR - 50 Administration License Image

Perception and Attention Functions: Visual-Spatial - WAFR - 50 Administration License
Model 64132-50

Test battery for the assessment of visual and spatial alertness.

CONTACT US

Lafayette Instrument Company
3700 Sagamore Pkwy N
Lafayette, IN 47904

Phone: (765) 423-1505
Fax: (765) 423-4111
info@lafayetteinstrument.com

 

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CONTACT US

Lafayette Instrument Company
3700 Sagamore Pkwy N
Lafayette, IN 47904

Phone: (765) 423-1505
Fax: (765) 423-4111

info@lafayetteinstrument.com

Copyright © 2009 - 2017 Lafayette Instrument Company. All Rights Reserved.