Brain Imaging & Analysis Center

This is an integer used to specify various attributes of this stimulus. It is interpreted as a bit-coded value, where each binary bit (1, 2, 4, 8, …) controls a different option. The meaning of each bit is described below; combine properties by adding the values.

    Value   Meaning
     0      no special attributes
     1      record response-time for this stimulus. All responses will be recorded, 
               regardless of the value of this flag, but response-times will only be 
               calculated if this bit is set.       
     2      send ID value to output port (SHOWPORT) when stimulus starts
     4      synchronize stimulus with physiological trigger       
     8      replace this stimulus with a fixation cross after DURATION has 
               passed (or movie has ended)       
    16      replace this stimulus with BACKIMAGE (see above)       
    32      erase this stimulus (paint over with back color) when it is done      
    64      add a fixation cross to visual stimulus when displayed
   128      allow time for preparing stimulus (for user-defined stimulus events)
   256      synchronize image stimulus with video refresh
   512      change the text font for this stimulus (font number must be specified). 
               This bit is set automatically when font is specified.
  1024      change the text color for this stimulus (color must be specified).
               This bit is set automatically when color is specified.
  2048      wait for a response (e.g. key press) before showing the stimulus
               (for debugging)

See Also:
Paradigm parameter file, Stimulus table

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