Lafayette Instrument Logo
Lafayette Instrument Logo

RELATED CATEGORIES
Computer Psych Assessment > Special Abilities Test Software

FLICKER FUSION ANALYZER AUTOMATIC METHOD - FLIM - 7 YEAR LICENSE

Model 64072

Flicker Fusion Analyzer Automatic Method - FLIM - 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

Objective test for the assessment of the activation level without self-evaluation.

APPLICATION

Assessment of the central-nervous activation (arousal) with the help of threshold values, when high frequency light is recognized as constant light. To be used with adults.

Main areas of application: clinical psychology, neuropsychology, medicine, and pharmacology.

THEORETICAL BACKGROUND

Physiological studies prove that the activation (arousal) of the organism is centrally controlled. The flicker-fusion frequency is regarded, next to other criteria (e.g. EEG, SCR) as an indicator for this centralnervous function capacity.

ADMINISTRATION

In the increasing process the frequency of a flickering light is augmented until a constant light is perceived.

In the decreasing process the frequency of a higher frequency light, that the respondent perceives as constant, is reduced until it is subjectively perceived as flickering. The respondent has to confirm every change of perception by pressing a key. The critical frequency is then stored.

The median values of the critical frequencies in the ascending or descending process are threshold values and they are called "Fusion frequency (VF)" and "Flicker frequency (FF)".

TEST FORMS

There are three standard test forms with five practice and eight measurement runs each available:

  • S1: Determines flicker and fusion frequency (increasing and decreasing measuring modes)
  • S2: Determines only fusion frequency (increasing measuring mode)
  • S3: Determines only flicker frequency (decreasing measuring mode)

SCORING

The following variables are scored:

  • "Fusion frequency VF (Hz)"
  • "Flicker frequency FF (Hz)"
  • "Error in measurement of VF (Hz)"
  • "Error in measurement of FF (Hz)"

The fusion frequency (VF) and flicker frequency (FF) mark the level of activation. The measurement errors of the median values serve as control variables. They make an estimate possible on how precisely the subject was able to determine the change from flicker to constant light. Additionally a diagram with the threshold values measured during the individual measurement cycles is displayed as well as the test protocol.

RELIABILITY

Special studies with senior executives produced split-half reliability coefficients of r=.92 for the fusion frequency (VF) and of r=.91 for the flicker frequency (FF). For a group of psychiatric patients values of r=.86 and r=.92 were found.

The stability coefficients for test-retest interval of between two and eight hours were of r=.86 (VF) and r=.85 (FF) for senior executives.

VALIDITY

In pharmacological studies, this method revealed biologically relevant differences starting at 0.8 Hz. Parallel to the decrease of the flicker and fusion frequencies, corresponding changes in other performance parameters were found (memory, attention, reaction speed etc.). Pharmacological studies are a frequent area of application for the FLIM. A multitude of studies were conducted in this area. For example the flicker-fusion frequency is a highly reliable indicator and a valid parameter for the measurement of sedation induced by medical drugs. A study by Görtelmeyer et al. (1982) found that the flicker-fusion frequency together with EEG-Variables are described by a common factor, which can be interpreted as the expression of cortically modulated attention.

NORMS

In test form S1 (increasing and decreasing measuring modes) norms for the age groups 18-38, 39-55 and 56-80 are presented for the variables "Flicker frequency (FF)" and "Fusion frequency (VF)". These comparative values (N=245) were gained from a comparative sample of psychiatric patients and a group of senior executives.

TESTING TIME

About 10 minutes.

DOWNLOADS

RESEARCH PAPERS AND BIBLIOGRAPHIES

Validity Report for FLIM

ACCESSORIES

REQUIRED ACCESSORIES

Flicker Fusion Unit Image

Flicker Fusion Unit
Model 64031

The Flicker Fusion Frequency test records activity (arousal) in the central nervous system.

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

Flicker Fusion Analyzer Automatic Method - FLIM - 50 Adminstration License Image

Flicker Fusion Analyzer Automatic Method - FLIM - 50 Adminstration License
Model 64072-50

Assessment of the central-nervous activation (arousal) with the help of threshold values, when high frequency light is recognized as constant light.

CONTACT US

Lafayette Instrument Company
3700 Sagamore Pkwy N
Lafayette, IN 47904

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

 

Home | Products | Support | About | Sitemap | Privacy

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


Top

PRODUCT SEARCH

Use this form to search for products from the Lafayette Instrument Online Family.



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.