Millisecond Forums

Cordially,

trial.mytrial.error =true

will not (and should not) work. Inquisit will even give you an explicit error message to the effect:

ERROR: Expression 'trial.mytrial.error' is invalid. The expression attempts to set the value of read-only property.

What you'll probably want to do is /branch to a separate <trial> element in case of latency exceeding your given threshold as in

<block myblock>
/ trials = [1-10=mytrial]
</block>

<trial mytrial>
/ stimulusframes = [1=mytext]
/ validresponse = (57)
/ branch = [if (trial.mytrial.latency >= 1500) trial.tooslowtrial]
</trial>

<trial tooslowtrial>
/ stimulusframes = [1=tooslowtext]
/ validresponse = (noresponse)
/ trialduration = 500
</trial>

<text mytext>
/ items = ("Press the spacebar as quickly as possible.")
</text>

<text tooslowtext>
/ items = ("You are too slow... Try harder.")
</text>

Finally, two further points:- Given that conventionally only latencies greater 10000ms are considered outliers in IATs (and hence are excluded from the computations to derive the D-score), 1500ms doesn't look awfully slow.- If you go ahead and implement the above /branch in your IATs, be aware that you'll have to make other adjustments to the script to accommodate for the change. In particular, you need to pay attention to the various values involved in deriving D and make sure that latencies stemming from the added 'tooslow' trial element are properly excluded from those computations.