Events that depend on Sample Clauses

Events that depend on the participant’s response In this example we’ll modify the Lexical Decision Demo so it gives feedback if the participant makes a mistake. First, we have to create an event to provide the feedback. We can’t simply present something on the screen and then move on to the next trial, as the participant won’t have a chance to read it. We also need to insert a delay (here, one second). In other words, we need to execute two separate events. To treat these events as a unit, we’ll create a new BlockEvent. For completeness, we’ll also clear the screen before presenting the feedback. TextEvent feedback_message "Sorry, wrong answer" DelayEvent feedback_pause 1000 BlockEvent error_feedback AddEvent clear_screen AddEvent feedback_message AddEvent feedback_pause Now we need to tell FLXLab to execute this event if the participant makes an incorrect response. The first step here is to tell FLXLab what the incorrect response is. To do this, we add another column to the stimulus list, with the key (f or j) corresponding to the incorrect answer (this will be f for words and j for non-words). We also need to tell FLXLab about this new column: LabelListColumn 4 incorrect_key This would be added right after the other LabelListColumn commands. Finally, we add our feedback event to the trial structure: TrialEvent trial AddEvent warning_signal AddEvent pause AddEvent clear_screen AddEvent pause AddEvent stimulus AddEvent wait_for_key AddEvent record_response AddEvent error_feedback "when $key equals $incorrect_key" More details on the equals condition are provided in section 4.4.