ETT Olfactometer 2, Manual

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© Emerging Tech Trans, LLC
Assembling paradigm
After defining the four general conditions of this tutorial, it is time to assemble them into an actual
paradigm. Groups are added via the
Add to paradigm button in the Group settings tab as previously
shown in Figure 53. Clicking this button will append the currently selected group to the end of the
paradigm. Repeat three times for each of the four groups with increasing lavender concentration (Figure
54).
Figure 54 - Each stimulus condition presented three times with increasing lavender concentrations.
Labeling conditions for data analysis
While not required, it might be useful to label conditions for post-processing purposes - especially when
using the
Group randomizer . In the multi-purpose tab Add / edit Triggers / Labels / EEG Dins, simply
select the duration of the label, type any label text into the Label textbox and it to paradigm. For the rest
of the duration of each group, add a Baseline label (Figure 55).
Figure 55 - Labeling conditions 'Lavender -x.y' and 'Baseline' for post-processing in an external tool.
Labels will appear in a separate log file called TrialMarkers . The onset of a label can also be tied to a
condition like a respiratory exhalation onset. For more information, consult the Using Triggers section at
the end of this manual.
Group randomizer
The paradigm proposed in this tutorial is intentionally not randomized in its group calls. The group
randomizer offers a unique way of pseudo randomizing parts of the study or the whole experiment. This
can be done once when creating a study or every single time a new subject is run. After creating all
groups and inserting potentially static portions of a paradigm, go to the
Group randomizer tab (Figure
56). It allows the user to clear the whole list of currently included groups in the paradigm. After setting
the number of trials, the list can be shuffled. A preview on the trial list to be added allows for reshuffling
if necessary. The
Append trial list to paradigm button allows the user to add the previewed list to the
existing paradigm. Figure 57 provides an example of a pseudorandomized paradigm.