DASS can perform two types of divided attention driving test - the 2D 'turbulence' test based on the work of George et. al. 1,2 and the 3D 'road' test based on the work in the laboratories of Land 3,4 and Stradling 5, 6, 7. Both types of test require the user to track using a steering wheel. The divided attention part of each test is that the patient has to visually search the periphery for a target number amongst a sequence of numbers and respond with button presses to the appearance of particular number. Both of these tests have been shown to be very different in patients with sleep apnoea compared to normal controls. We can provide the software (W95/98/NT/2000/XP) and full size steering wheel.
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2D Turbulence Test (George et al)
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The 2D test is designed to simulate steering down a motorway (or 'freeway') while being buffeted by side winds.The patient is required to steer the car (to keep a cursor within a central white box which represents the safe space for a car) while a forcing function (a sum of 6 sine-waves) is applied to move the car pseudo-randomly from side to side.
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> A Practice Run allows the patient to get a feel for the program before the main run begins
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> The Target Number can be set
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> The frequency, period and amplitude of the turbulence parameters can be set.
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View and print the tracking plot, the target number results and the 2D results: Number of presses, Nil responses, No response periods, Average Response time, Maximum deviation, and Standard Deviation responses, No response periods, Average Response time, Mean Error, Absolute Error, Standard Deviation, Off-road events
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