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| ID of channel for horizontal eye position. | ID of channel for horizontal eye position. Usually 0. |
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| ID of channel for vertical eye position. | ID of channel for vertical eye position. Usually 1. == Local system setup == === Monitor === * {{{ Distance }}} Viewing distance between eyes and screen in mm. * {{{ Frame rate }}} Refresh rate of the screen. * {{{ Height }}} Height of the screen in mm. * {{{ Width }}} Width of the screen in mm. ==== Resolution ==== * {{{ Horizontal }}} Number of horizontal pixels (columns). * {{{ Vertical }}} Number of vertical pixels (rows). === Stimuli === * {{{ Clear Screen at the End of Experiment }}} If activated, the screen is cleared when the experiment is finished or stopped. * {{{ Frameerror handling }}} 0: strict, system assumes that calculation of a new frame lasts less than 1/framerate seconds.<<BR>> 1: tolerant, system allows the frame calculation to be longer than 1/framerate seconds. Especially useful in conjunction with movie primitives. * {{{ Minimum trial duration }}} Use this parameter, if you want to ensure, that the time between the start of two consecutive trials is constant. Deactivated, if set to -1. === Stimulus window === Parameters defining the graphics output. You will have to restart nrec to apply these settings. * {{{ Full screen }}} If activated, the whole screen is used instead of a window. * {{{ Graphics system }}} DirectFB is obsolete. Use "X Window". * {{{ Height }}} Number of vertical pixels (rows). * {{{ Width }}} Number of horizontal pixels (columns). * {{{ X Display Name }}} Choose the appropriate X Display. For Notebooks e.g., the external screen normally is :0.1<<BR>> Caution: If the chosen display is not GLX capable, nrec might not start up anymore. You will then have to edit .nrec.cfg manually or using a XML-editor and set this parameter back to a valid value. |
Documentation of nrec Parameters
Contents
1. Data Acquisition
sampling rate
- Acquired samples per second by the daq card.
SubdeviceID for AIn eye position recording (16ch)
The ID of the analog input subdevice (find out via comedi_test -t info).
SubdeviceID for DIn spike recording (24ch)
The ID of the digital input subdevice (find out via comedi_test -t info). If no spikes or comparable digital signals are to be recorded, set this value to -1.
SubdeviceID for other DIO (8ch)
The ID of the digital in-/output subdevice (find out via comedi_test -t info). The trial trigger is on channel 0 output. The other channels may be used for response buttons, reward signals, LEDs and similar things.
2. Experiment file
Experiment file
- Path and filename of the last experiment configuration used. Usually this is not modified here.
3. Eye position module
3.1. Calibration
Channel 0
Currently used horizontal calibration coefficients. These are the 6 coefficients a,b,c,d,e,f in the voltage (x) to gaze_angle funtion:
ganze_angle = a + b * x + c * y + d * x2 + e * x * y + f * y2.
Usually this is not modified here.
Channel 1
Currently used vertical calibration coefficients. These are the 6 coefficients a,b,c,d,e,f in the voltage (x) to gaze_angle funtion:
ganze_angle = a + b * x + c * y + d * x2 + e * x * y + f * y2.
Usually this is not modified here.
# Channels
- Number of channels used for eye position calibration. Use 1 for x-only mode or 2 for x-y-mode.
# Coefficient/channel
- Number of calibration coefficients per channel. Order of the polynomial in the above equations. Currently only a value of 6 is implemented.
3.2. Input hardware
# Channels
Number of channels used for eye position measurement. Currently only a value of 2 is implemented.
Usually this is not modified here.
Device ID
- Device ID for eye movement data acquisition. Usually 0.
Subevice ID
- Subdevice ID for eye movement data acquisition. Usually equals DAQ/SUBDEVICE_ID_AIN.
X Channel ID
- ID of channel for horizontal eye position. Usually 0.
Y Channel ID
- ID of channel for vertical eye position. Usually 1.
4. Local system setup
4.1. Monitor
Distance
- Viewing distance between eyes and screen in mm.
Frame rate
- Refresh rate of the screen.
Height
- Height of the screen in mm.
Width
- Width of the screen in mm.
4.1.1. Resolution
Horizontal
- Number of horizontal pixels (columns).
Vertical
- Number of vertical pixels (rows).
4.2. Stimuli
Clear Screen at the End of Experiment
- If activated, the screen is cleared when the experiment is finished or stopped.
Frameerror handling
0: strict, system assumes that calculation of a new frame lasts less than 1/framerate seconds.
1: tolerant, system allows the frame calculation to be longer than 1/framerate seconds. Especially useful in conjunction with movie primitives.
Minimum trial duration
- Use this parameter, if you want to ensure, that the time between the start of two consecutive trials is constant. Deactivated, if set to -1.
4.3. Stimulus window
Parameters defining the graphics output. You will have to restart nrec to apply these settings.
Full screen
- If activated, the whole screen is used instead of a window.
Graphics system
- DirectFB is obsolete. Use "X Window".
Height
- Number of vertical pixels (rows).
Width
- Number of horizontal pixels (columns).
X Display Name
Choose the appropriate X Display. For Notebooks e.g., the external screen normally is :0.1
Caution: If the chosen display is not GLX capable, nrec might not start up anymore. You will then have to edit .nrec.cfg manually or using a XML-editor and set this parameter back to a valid value.
... to be continued