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Model 12021A User Instructions
7
Running with PsymLab Software
Lafayette Instrument Company’s PsymLab software contains three protocols that may be used to administer
tests, save results along with subject information, and create reports. These protocols include: Automatic
Method, Adaptive Method, and Self-Control Method.
Connecting to a computer running PsymLab requires a serial-to-USB converter (Model 12021A-USB) in addition
to the DB9 serial cable provided with the device. Power up the Model 12021A control before starting the software.
In Automatic Method, PsymLab automatically runs a test using the Ascending Auto Frequency Mode to
determine the fusion frequency and the Descending Auto Frequency Mode to determine the flicker frequency.
The results of these two tests are averaged to obtain the CFF value. In this method, the subject responds by
pressing either side of the hand-held subject response switch.
In Adaptive Method, PsymLab uses the Discrete Mode to display fixed frequencies and allows the test subject
to respond to the frequencies as “flicker” or “fusion”. PsymLab uses the responses to “zero in” on the CFF value.
Please notice the symbols on the black hand-held subject response switch. The half-moon shape with dotted
lines extending out symbolizes a response of “flicker”. The half-moon shape with solid lines extending out
symbolizes a response of “fusion”.
In Self-Control Method, PsymLab uses the Continuous Mode to display a starting frequency and allows the test
subject to select whether to increase or decrease the frequency. The test is complete when the test subject
cannot discern whether the frequency is a flicker or a constant. Please notice the symbols on the black hand-
held subject response switch. The “+” symbolizes a response to increase the frequency. The “-“ symbolizes a
response to decrease the frequency. The amount of the increase or decrease becomes smaller as the subject
“zeros in” on the CFF.
More details on these methods and corresponding settings are available in the PsymLab manual.
Photosensitivity Warning
A small percentage of people may experience symptoms of photosensitivity when exposed to flashing
lights. These symptoms include feelings of nausea, dizziness, migraines, visual distortions, or photosensitivity
induced seizures characterized by one or more of the following: lightheadedness, altered vision, eye or face
twitching, jerking or shaking of arms or legs, disorientation, confusion, loss of consciousness or convulsions
that can lead to injury from falling or collision. Symptoms can occur in individuals with no history of seizures
or epilepsy. Immediately stop using the Flicker Fusion if you experience any of the above symptoms. Consult
a physician before using the Flicker Fusion if you or a relative have a history of seizures or epilepsy.
