InstantForum 2017-1 FinalMillisecond Forumshttps://forums.millisecond.com/Millisecond ForumsFri, 17 Apr 2026 12:45:47 GMT20https://forums.millisecond.com/Topic14104.aspxHello everyone!<div><div><div><br/></div><font face="arial, helvetica, sans-serif" style="color: rgb(0, 0, 0); line-height: normal; background-color: rgb(255, 255, 255);">My task is quite simple: I flash letters on the screen and if there is an A followed by an X, that is a target so subjects click the left mouse button. If it is any other sequence of two letters, it is a non-target, so subjects click the right mouse button.<div><div><br/></div>In this particular trial, there is a voice that says "If X Target" when it is A followed by X, and a voice that says "Nontarget" when it is any other sequence (latter half code not shown below).</div><div><br/></div></font><div style="line-height: normal; margin: 0px; padding: 0px; border: 0px; outline: 0px; background-image: initial; background-repeat: initial;"><font color="#000000" face="arial, helvetica, sans-serif">So the sequence should be:<div><div><br/></div>blank</div><div>A<div>blank&nbsp;<div>X<div>blank&nbsp;<div>"If X Target"</div></div></div></div><div><div><br/></div>But it is currently:<div><br/></div><div>blank<div>A<div>blank<div>X<div>"If X Target"</div></div></div></div></div></div></div><div><br/></div></font></div></div><div>So the sound is coming when the X is still on the screen. If I go to the stimulusframes in &lt;trial ax_xWAND&gt; (bolded line of code below) and insert a blank after ax_x to try to fix this, the X doesn't even show up and the whole branched trial gets messed up. How do I go about inserting the blank while retaining the X so then the "If X Target" voice shows up when the screen is blank right after the X? Any insight into this matter would be appreciated greatly. Thank you very much!</div><div><br/></div><br/></div><div><div>&lt;trial ax_aWAND&gt;</div><div>/ stimulusframes = [1=blank, ax_a]</div><div>/ pretrialpause = 800</div><div>/ trialduration = 1950</div><div>/ posttrialpause = 900</div><div>/ validresponse = (" ", noresponse)</div><div>/ correctresponse = (noresponse)</div><div>/ branch = [trial.ax_xWAND]</div><div>/ ontrialend = [if ( block.ax.totalcount &gt;= 2 &amp;&amp; trial.ax_aWAND.correct == false ) values.axtestcomissionerrorcount += 1]</div><div>/ ontrialend = [if ( block.ax.totalcount &gt;= 2 ) values.axtestcomissiontrialcount += 1]</div><div>/ ontrialend = [if ( block.ax.totalcount &gt;= 2 ) &nbsp;values.axtestcomissionerrorrate = values.axtestcomissionerrorcount / values.axtestcomissiontrialcount ]</div><div>&lt;/trial&gt;</div><div><br/></div><div>&lt;trial ax_xWAND&gt;</div><div><strong>/ stimulusframes = [1=blank, ax_x, <span style="background-color: rgb(59, 111, 245);"><font color="#f7f7f7">IfXTarget</font></span>]</strong></div><div>/ pretrialpause = 100</div><div>/ trialduration = 1250</div><div>/ posttrialpause = 800</div><div>/ inputdevice = mouse</div><div>/ correctresponse = (lbuttondown)</div><div>/ ontrialend = [if ( block.ax.totalcount &gt;= 2 &amp;&amp; trial.ax_xWAND.correct == false ) values.axtestomissionerrorcount += 1]</div><div>/ ontrialend = [if ( block.ax.totalcount &gt;= 2 ) values.axtestomissiontrialcount += 1]</div><div>/ ontrialend = [if ( block.ax.totalcount &gt;= 2 ) &nbsp;values.axtestomissionerrorrate = values.axtestomissionerrorcount / values.axtestomissiontrialcount ]</div><div>&lt;/trial&gt;</div></div>Sat, 30 Aug 2014 15:26:25 GMTAnoushka Shahanehttps://forums.millisecond.com/Topic14112.aspxIn addition note that /stimulustimes exists as an alternative to /stimulusframes. /stimulustimes allows you to specify the desired presentation timing in milliseconds instead of ordinal frame number:<div><br/></div>/ stimulustimes = [0=a,b,c; 100=d,e; 500=f; ...]<br/>Sat, 30 Aug 2014 15:26:25 GMTDavehttps://forums.millisecond.com/Topic14111.aspxExcellent, thank you very much for your assistance. I thought that stimulusframes were just flashed consecutively -- this makes way more sense now. Thank you!Sat, 30 Aug 2014 13:43:05 GMTAnoushka Shahanehttps://forums.millisecond.com/Topic14105.aspx<strong>/ stimulusframes = [1=blank, ax_x, <span style="background-color: rgb(59, 111, 245);"><font color="#f7f7f7">IfXTarget</font></span>]<div><br/><div>means you're presenting blank, ax_x and IfCTarget all in the same, 1st frame, i.e. at the exact same point in time.<div><br/></div>If you want your sound to be played at a later point, you ought to present it at a later point in time, i.e. something along the lines of<div><br/></div><strong>/ stimulusframes = [1=blank, ax_x; 20=blank, <span style="background-color: rgb(59, 111, 245);"><font color="#f7f7f7">IfXTarget</font></span>]</strong><div><div><br/></div>adjusted to whatever timing you want or need.<br/></div></div></div></strong>Fri, 29 Aug 2014 13:29:10 GMTDave