ScannerSynch

ScannerSynch provides an interface for National Instruments PCI 6503 card used to capture all pulses (scanner synch pulse and button pulses alike).

For more information, type in MATLAB

help ScannerSynchClass

Any problems, report them to Tibor Auer.

Obtain ScannerSynch

• ScannerSynch is available on all relevant PCs (StimPCs, "mimic" PC)

• From your desktop PC (Windows), you can also have a copy from \\cbsu\data\Group\Imaging-Local\cbu\matlab

• You can also download it from here (right-click and "Save As...")

Using ScannerSynch

Initialise

• Default. Use only if device (scanner, pulse emulator) is connected (only in StimPCs and mimic PC)!

• SSO = ScannerSynchClass;
  

• Emulations:

• SSO = ScannerSynchClass(1);   % emulate scanner synch pulse
  

• SSO = ScannerSynchClass(0,1); % emulate button box
  

• SSO = ScannerSynchClass(1,1); % emulate scanner synch pulse and button box
  

Close

ScannerSynchClass has a destructor, which is automatically triggered if the object is deleted (e.g. clear, returning function). If you use a script, however, it does not perform any auto-clear, so you have to destroy the object manually:

• SSO.delete;
  

Capture scanner synch pulse

• Simple case

• SSO.SetSynchReadoutTime(0.5);  % make sure that you do not detect the same pule twice
  SSO.TR = 2;                % allows detecting missing pulses
  while SSO.SynchCount < 10  % polls 10 pulses
      SSO.WaitForSynch;
      fprintf('Pulse %d: %2.3f. Measured TR = %2.3fs\n',...
          SSO.SynchCount,...
          SSO.TimeOfLastPulse,...
          SSO.MeasuredTR);
  end
  

• Chance for missing pulse

• SSO.SetSynchReadoutTime(0.5);  % make sure that you do not detect the same pule twice
  SSO.TR = 2;                    % allows detecting missing pulses
  while SSO.SynchCount < 10      % until 10 pulses
      WaitSecs(Randi(100)/1000); % in every 0-100 ms ...
      if SSO.CheckSynch(0.01)    % ... waits for 10 ms for a pulse
          fprintf('Pulse %d: %2.3f. Measured TR = %2.3fs. %d synch pulses has/have been missed\n',...
              SSO.SynchCount,...
              SSO.TimeOfLastPulse,...
              SSO.MeasuredTR,...
              SSO.MissedSynch);
      end
  end