STISIM Drive
(SDL) - DA - Divided Attention
Display a divided attention
symbol in one of the small boxes found at the top of the display on both the
right and left hand sides. From the configuration form, this event uses the
"Mean divided attention response time" on the Post Run tab, and the
"Maximum divided attention display time" on the Initialize tab. The
symbols will be displayed until the driver responds, or until the maximum time
has elapsed. When a horn symbol is requested, the program will display the horn
symbol in the specified "mirror", and the driver will be required to
press the horn in response (the horn should not be used with the simplified
steering system). When a turn indicator response is requested, a triangle
pointing either left, right, up or down will be displayed (left pointing
triangle in the left "mirror", right pointing triangle in the right
"mirror" and the up and down triangles in either "mirror").
When this appears, the driver must respond by using the turn indicator to
signal a turn in the direction of the triangle. With the simplified steering
system, the driver must press either the left or right control yoke button.
EVENT PARAMETERS:
|
PARAMETER 1: |
Divided attention display
options. To specify the divided attention display, set parameter 1 to one of
the following: 0 - Default symbols |
|
PARAMETER 2: |
Divided attention action
options. To specify the divided attention action, set parameter 2 to one of
the following: 0 - driver is suppose to
respond to symbols, events will continue to appear whether the driver
responds or not 1 - Wait till the driver
responds or the maximum response time is met before processing the next event 2 - Wait till the driver
responds correctly before processing the next event, if they respond
incorrectly play the "DAERROR.WAV" file 3 - Display the symbol until another DA event is processed |
|
PARAMETER 3: |
Volume control if the "DAERROR.WAV" file is played. Values range from 0 to 10. |
EXAMPLES:
1000,DA,1,1
1000,DA,1,0
1000,DA,1,2,8
1000,DA,1,3
Divided attention tasks are
used to determine if the driver is alert and paying attention to the entire
roadway display. The 4 examples shown illustrate a normal divided attention
event and 3 that would be used in a training scenario.
The first example would be
used during a regular simulation run. After the driver has traveled 1000 feet
down the road the default symbol in the left hand side "mirror" will
change from a diamond to a left pointing triangle (1000,DA,1). The second
parameter tells the software to record the user’s response and to turn the
symbol back to the default after the user has responded, or when the maximum
response time has elapsed (See Configuration Form, Initialize tab,
"Maximum divided attention response time").
The remaining 3 examples
all would be used when training a driver. In each example the first 3
parameters are the same, it is only the divided attention action option that
changes. After the driver has traveled 1000 feet down the road the default
symbol in the left hand side "mirror" will change from a diamond to a
left pointing triangle (1000,DA,1). When the second parameter is set to 0, the
divided attention symbol will remain on the screen until the driver responds,
no matter how much time it takes. This is generally used to familiarize the
driver with the divided attention task and how the response is triggered. When
the second parameter is set to 2, the system displays the divided attention
symbol on the screen and then holds all events until the driver responds
correctly to the symbol shown. If the driver responds incorrectly, a recorded
message will be played to inform them that their response was wrong and to try
again. In this case, the additional volume control parameter can also included
so that the message is played louder or softer than other sound effects. When
the driver responds correctly, the simulation will continue. This option is
used to automate a training scenario so that the driver knows the correct
response trigger for each symbol. When the second parameter is set to 3, a
symbol will be displayed continuously until a new divided attention event is
processed. This is used to show the different symbols to the drivers without
having to make them respond.