Millisecond Forums

Hi!

I'm trying to make an experiment where participants see a flash on the screen and indicate where it's on the left side (press A key) or right side (press L key) of the screen. On each trial, a name is presented, followed by a mask and a mask eraser. It works fine, but I notice that in some trials, when I respond very fast, it doesn't go to the next trial, I have to press the key twice or three times to move on to the next trial. Do you have any idea on what the problem might be and how to solve it? Thanks!!

<item names>
/1 = "Alice"
/2 = "Bob"
/3 = "John"
/4 = "Jack"
/5 = "Mary"
</item>

<item mask>
/1 = "QWEREWEROSXFF"
</item>

<text namesleft>
/ items = names
/ fontstyle = ("Courier",5%, false, false, false, false, 5, 0)
/ txcolor = white
/ txbgcolor = black
/ position = (20%,50%)
</text>

<text maskleft>
/ items = mask
/ fontstyle = ("Courier",5%, false, false, false, false, 5, 0)
/ txcolor = white
/ txbgcolor = black
/ position = (20%,50%)
</text>

<text eraserleft>
/ items = mask
/ fontstyle = ("Courier",5%, false, false, false, false, 5, 0)
/ txcolor = black
/ txbgcolor = black
/ position = (20%,50%)
</text>

<text namesright>
/ items = names
/ fontstyle = ("Courier",5%, false, false, false, false, 5, 0)
/ txcolor = white
/ txbgcolor = black
/ position = (80%,50%)
</text>

<text maskright>
/ items = mask
/ fontstyle = ("Courier",5%, false, false, false, false, 5, 0)
/ txcolor = white
/ txbgcolor = black
/ position = (80%,50%)
</text>

<text eraserright>
/ items = mask
/ fontstyle = ("Courier",5%, false, false, false, false, 5, 0)
/ txcolor = black
/ txbgcolor = black
/ position = (80%,50%)
</text>

<trial left>
/ posttrialpause = 1000
/ stimulustimes = [0 = namesleft; 62 = maskleft; 124 = eraserleft]
/ validresponse = (30,38)
/ correctresponse = (30)
/ inputdevice = keyboard
</trial>

<trial right>
/ posttrialpause = 1000
/ stimulustimes = [0 = namesright; 62 = maskright; 124 = eraserright]
/ validresponse = (30,38)
/ correctresponse = (38)
/ inputdevice = keyboard
</trial>


<block task>
/ screencolor = black
/ trials = [1-10 = noreplace(left,right)]
</block>

<expt task>
/ blocks = [1=task]
</expt>