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			            There isn't any built-in feature or variable, if that's what you mean. You can, however, program this yourself. E.g. add a <values> entry to the script
  <values> ... / completed = false </values>
  and set that value to 'true' at the very end of the procedure (e.g. by running a short <trial>)
  <trial endtrial> / ontrialend = [values.completed = true] / trialduration = 10 </expt>
  Log the value to the (summary / raw) data file. If someone quits prematurely it will be false, only if completed it will be true.                 
			            				
			                                 
                     
                                            
                         
                    
                  
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