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--- biac:experimentalcontrol:biac6hardware [2024/04/15 19:49]
cmp12 [BIAC6 Screen Configuration]
+++ biac:experimentalcontrol:biac6hardware [2024/04/15 20:26]
cmp12 [BIAC6 Screen Configuration]
@@ Line 131: / Line 131: @@
 >> run SetupPsychtoolbox.m
->> Screen('Screens')
+>> screens = Screen('Screens')
 ans =
+  % there is only a single screen
+  % you can use the first index, or min / max functions because there is only 1 option
+>> screens(1)
+ans =
+>> min(screens)
+ans =
+>> max(screens)
+ans =
 </code>
@@ Line 152: / Line 167: @@
-Any **EXTENDED** configuration will result in multiple monitors being available
+Any **EXTENDED** configuration, or configuration with goggles will result in multiple monitors being available.
 PTB:
 <code matlab>
 >> run SetupPsychtoolbox.m
->> Screen('Screens')
+>> screens = Screen('Screens')
 ans =
      1     2
    %in this case
-   % 0 - the full display across the extended desktop
+   % 0 - the full extended display across the desktop
-   % 1 - screen #1
+   % 1 - screen #1 only
-   % 2 - screen #2
+   % 2 - screen #2 only
+   % because matlab is indexed a 1, you need to select the correct index to get to screen #1
+>> screens(2)
+ans =
 </code>
@@ Line 182: / Line 203: @@
  # screens[1] is the second screen because python is zero indexed
+</code>
+You need to code your tasks to send to the specific screen you want your subjects to see.  If they are viewing the projector, then they can only single a screen at a time.  The default is to send the first display to the projector.
+  * screen 0 in matlab **only** if its a **cloned** display, or screen 1 if it is extended/goggles
+  * screen 0 in PTB
+One of the best ways to account for a variable to setup in matlab would be to code the task to work with either.
+<code matlab>
+screens=Screen('Screens');
+%if there is only 1 entry
+if (length(screens) == 1)
+    %use it
+    S.screenNumber = min(screens);
+%but if there are more, use #1 explicitely
+elseif (length(screens) > 1)
+    S.screenNumber = screens(2);
+    %same as S.screenNumber = 1;
+end
+[S.Window, S.screenRect]=Screen('OpenWindow',S.screenNumber, S.screenColor,[],[],2,[],[]);
 </code>

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