Scanner: Siemens Magnetom Prisma 3T, XR 80/200 gradient coil, Head/Neck 20 and 64 channels

Projector: Vpixx PROPixx 1440 Hz

Projektor-Scanner Interface: Translucent rear-projection screen was a custom-made sandblasted/calendered acrylic flat plane manufactured by our Department of Chemistry

Response Unit: Celeritas fMRI Button Response System

MRI Goggles: MediGlasses for MRI - Full Set

You can find the MRI scanner here

Select the Parallel Port Device

LTP1

Address

0xD050

Port Input Channels

Trigger Channel

Properties Port:

LPT1

Data Source:

Status Port

Use Interrupt

Unchecked

Mask

Empty

Inversion Mask

0

Independent lines:

Checked

We will use the Parallel Port device (LPT1) with the address 0xD050

In order to Initialise the Trigger:

ioObj = io64;
checkTriggerSignal64(2,2,ioObj);
triggerNo=0;
triggerList=[];
 

Remember to Start the stimulus at the first trigger signal (If you have dummy scans, you just need to change this number)

while triggerNo~=1
  [triggerNo,triggerList]=checkTriggerSignal64(0,2, ioObj);
end

At the end of your stimulus, don't forget to clear the Object before exiting the code

checkTriggerSignal64(-1,2, ioObj);
clear ioObj;

RIGHT HAND

1!
2@
3#
4$
5%

LEFT HAND

6^
7&
8*
9(
a

Measurements performed through: Minolta colorimeter (CS-100 Chroma Meter)

Mean luminance of the screen: 86 cd/m2

Minimum and maximum luminance values are 0.2 cd/m2 and 172 cd/m2, respectively

Stimuli can be presented via a separate PC that is connected to a beamer. The possible resolution is 1024 x 768 at 60 Hz. The beamer projects the image onto a glass (screen) at the bore entrance which can be seen by the participant through the head coil mirror.

Distances:

* screen - mirror: 90 cm
* mirror - eyes:  ~15 cm

→ screen - eyes:  105 cm

Projected image size (full screen on glass) and approximate viewing angles:

* horizontal: 41.5 cm : 22.3°
* vertical:   30.5 cm : 16.5°