User`s guide

E-Prime User’s Guide
Chapter 3: Critical Timing
Page 104
Duration field for the object controlling the event. The response time will be measured from the
onset time of the object presenting the critical stimulus and enabling the response (e.g., the
Probe display), to the time of the response.
The TimingParadigm1 experiment shows an example of such a paradigm (see Figure 14). The
critical time segment is just the Probe object. In the experiment, instructions are presented at the
beginning of the trial, and the subject presses the spacebar to continue. Then, a fixation (“+”) is
presented for 0.5 seconds followed by the probe. The probe is displayed for 2 seconds, or until
the subject responds. A FeedbackDisplay object is used to provide feedback at the end of each
trial.
Figure 14. TimingParadigm1 Structure view
The only time-critical function in this paradigm relates to the response collection. The Probe
object should set the timing mode to Event (default) and PreRelease to 0 (default). The response
should enable keyboard input for the duration of the stimulus, and terminate on a response (See
Figure 15).
Figure 15. Duration/Input tab for the single critical stimulus event (Probe).