Changing (removing) a text stimulus while the mouse is being tracked

Comments

• eduard

  April 2019

  Hi,

  
  

  I don't like this solution as it is rather hacky and probably produces messy logfiles, but see for yourself whether it helps you. Basically, I make the last word appear in a special sketchpad linked to a special mousetrap item, lasting only for 300ms before the experiment moves on to the actual response item.

  Normally, I would try to implement it all in plain python script (as I am not used to the Mousetrap plugin), so I tried to help you, without introducing too many structural changes.

  example.osexp

  Eduard

  
• quartz_pool

  April 2019

  Many thanks for taking the time to think about this (and solving my problem)!

  I'm doubly relieved; your suggestion is definitely a workable solution, plus it's sort of nice to see that I didn't miss some really un-hacky way of doing things (with a singular mousetrap-item) 😀. And I think the resulting log files should be manageable, as mousetrap-os has a neat output anyways, timestamps and all.

  I noticed that, in the special 'last word'-sketchpad as well as in the main mousetrap item, you reduced the desired time period of 300ms to slightly shorter values, which is in keeping with the logic found in https://osdoc.cogsci.nl/3.2/manual/timing/. Is there a specific reason, though, why you chose 295ms for the sketchpad and 290ms for the mousetrap item?

  Again, thank you very much for your kind help.
• Pascal

  April 2019

  Hi all,

  thanks a lot @eduard for providing a solution! I was out of office for a conference so I only checked the forum again today.

  Regarding the times < 300 ms: I think that this has to do with ensuring an accurate presentation time taking the monitor refresh rate into account - an issue that is discussed in more detail here: https://osdoc.cogsci.nl/3.2/manual/timing/#making-the-refresh-deadline However, this is just a guess so please correct me if I am wrong, Eduard.

  When looking at Eduard's solution, I noticed one minor thing: I think that the duration of the lastWord sketchpad should be set to 0, as its presentation duration is already controlled by the Timeout value of the subsequent tracking_1 mousetrap_response item.

  There are probably also a number of additional fine tuning things required, e.g., thinking about whether participants should already be able to provide an answer as soon as the last word is displayed or only after it disappears (in the latter case you could set the number of buttons for tracking_1 to 0). In addition, the initiation time warning should only be displayed on one of the mousetrap_response items (if you do want to display one at all), depending on how you instruct the participants.

  Best,

  Pascal
• quartz_pool

  July 2019

  Hi Eduard, hi Pascal,

  thanks for your input and especially the helpful correction regarding the sketchpad duration!

  I'm just posting to state that the experiment containing Eduard's solution is running very nicely and the log files are easily manageable, thanks to the great mousetrap R package.

  Best

  quartz_pool