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Update blocksCounterbalance.rst
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scale images and add reference to counterbalanceroutine
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RebeccaHirst authored Dec 24, 2024
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Blocks of trials and counterbalancing
--------------------------------------

Note that for PsychoPy version 2024.1 onwards you can use a :ref:`counterbalanceroutine` for counterbalancing.

Many people ask how to create blocks of trials, how to randomise them, and how to counterbalance their order. This isn't all that hard, although it does require a bit of thinking!

Blocking similar conditions
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The last part of the puzzle is how to assign participants to groups. For this you *could* write a Code Component that would generate a variable for you (`if.....: groupFile = "groupB.xlsx"`) but the easiest thing is probably that you, the experimenter, chooses this using the GUI we present at the start of the experiment. So, we add a field to our GUI using experiment settings:

.. image:: experimentSettingsGroup.png
:scale: 100 %
:scale: 50 %

Note that entering a *list* as the default input will present us with a dropdown in our GUI.

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For our outer loop we will use conditions files that look something like this:

.. image:: counterbalanceTasksCondFile.png
:scale: 100 %
:scale: 50 %

Each row corresponds to how many times a subtask routine (or set of routines) will be repeated per iteration of the outer loop.

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