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FLIM Flicker/Fusion Frequency

W. Neuwirth & G. Eberhardt
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Application

Measures current central nervous activation (arousal).
The flicker-fusion frequency is regarded, with other criteria (e.g. EEG, SCR), as an indicator of the functional readiness of the central nervous system. The test is frequently used in clinical and pharmacological research. A number of studies have been conducted in the field of clinical neuropsychology, e.g. to measure drug-induced sedation.

Administration

The flicker frequency is measured using an increasing measurement technique. This means that the frequency of the flickering light is increased until a steady light is perceived. The fusion frequency is measured using a decreasing technique. This means that the frequency of a high-frequency light that the respondent perceives as a steady light is reduced until it subjectively starts to flicker. The respondent presses a button at the point at which this change in perception occurs.

Test forms

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

Scoring

The following main variables are scored:

Fusion frequency (in Hz) and flicker frequency (in Hz) provide a measure of the activation level. The subsidiary variables provide information on reaction accuracy.

Scoring elements

Table
Profile
Working time
Confidence interval
Profile analysis
Test protocol
Item analysis protocol
Progress chart
Special diagrammatic representation of results
Personalized Word report
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Test type

Special Ability Tests

Test information

adaptive
modular
language-free item material
parallel test form
conforms to the Rasch-model
additional device required
high level of test security
wide norm spectrum
test form available for online presentation - open mode
links to CogniPlus
supervisor-supported testing

Languages

English
French
German
Hungarian
Italian
Polish
Russian

Duration

approx. 10 minutes

Age

Norms for ages 16+.