DMDX Help.


Continue Progressive X Keyword

<ContinueProgressiveX>
<cpx>
<cp>

    This keyword is used for word by word sentence reading tasks replacing the need to use the Response Contingency keyword. This keyword allows <ProgressiveX> to be used across items, where the first item uses <px> and following items that need to continue spacing where the previous item finished use <cpx>. Both <px> and <cpx> only need be used once at the beginning of an item.

    For example, the old form of word by word sentence reading using Response Contingency would be:

1 <px .1> + "hickory " / - ! "dickory " / + ! "dock " / + ! "the " / + ! "mouse " / + ! "ran "/ + ! "up "/ + ! "the " / + ! "clock";

    This would produce responses for items 1 to 9. The new form, while more expansive sticks to standard constructs and explicitly shows which frame produces which RT (extra spaces outside the quotes are just illustrative):
 
+1 <px .1> * "hickory ";
-2 <cpx> * !         "dickory ";
+3 <cpx> * !                 "dock ";
+4 <cpx> * !                      "the ";
+5 <cpx> * !                          "mouse ";
+6 <cpx> * !                                "ran ";
+7 <cpx> * !                                    "up ";
+8 <cpx> * !                                       "the ";
+9 <cpx> * !                                           "clock";
   
    Other keywords that are likely to be used in conjunction with <px> and <cpx> are <Delay 0> in the parameters or <delay 2> in each item if you are doing a mixed mode task, <ContinuousRun> and <NoFeedback>. Should scrambling of item files be required the <VariableGrouping> keyword will allow you to deal with sentences with different numbers of words in them.
   
    If you are using DMDX 6.3.4.2 or later and wanted a right to left Urdu sentence reading task in a mixed mode item file where using <delay 0> in the parameters isn't feasible you might have this:
<fd 30> <cr> <nfb>
+1 <px .8 right2left> *                                        "ہیکوری ";
-2 <delay 2> <cpx> * !                                   "ڈکیوری ";
+3 <delay 2> <cpx> * !                              "گودی ";
+4 <delay 2> <cpx> * !                            "دی ";
+5 <delay 2> <cpx> * !                       "چوہا ";
+6 <delay 2> <cpx> * !              "بھاگ گیا ";
+7 <delay 2> <cpx> * !          "اوپر ";
+8 <delay 2> <cpx> * !       "دی ";
+9 <delay 2> <cpx> * ! "گھڑی";

    As with the above example spaces outside the quotes here are simply illustrative and have no effect on the display.




DMDX Index.