Voluntary language switching task materials used in Declerck and Kirk (2021; 2023).

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This task is a short 10-word test of the participants knowledge of Scots words that feature in the Dundonian dialect.

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Adaption of the English LexTale task - this uses a green tick or red cross to indicate word/non-word responses.

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A task for participants to check their microphone is working. The participant is instructed to produce a sound and play it back to confirm that the recording has worked.

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A short demonstration of the task featuring a Dundonian/English speaker naming pictures of objects. This contains 3 spreadsheets - one presented prior to the blocks in which participants name in Dundonian only, one prior to the blocks in which they name in English only, and one prior to the blocks in which they can voluntarily name the objects in either language.

Overall the experiment present 3 main sections. A pure block section (either SSE or DDN), followed by the voluntary section, followed by the other pure block. Each section contains a demo, practice then main task. The voluntary section always comes in the middle, so the demo there begins with some text that signifies the end of the previous section. Likewise, the end of the main VLS task contains text outlining the beginning of the next section as these are fixed in place no matter what pure blocks get presented first or last.

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A task which outlines the stimuli to be used in the main experiment, their lexical labels and the option to hear a speaker produce the items in Dundonian.

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A short practice block where the participant names a random selection of items. This contains 3 spreadsheets - one presented prior to the blocks in which participants name in Dundonian only, one prior to the blocks in which they name in English only, and one prior to the blocks in which they can voluntarily name the objects in either language.

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This is the Experimental Tree.

The tree determines the order of Single Language Block - Voluntary Language Blocks - (Other) Single Language Block using two branched pathways.

Each new section contains a Demo and Practice before commencing the Main task for that section.

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This is the main task.

The task is fed through various spreadsheets:

One that runs 40 trials in a single language block for Dialect (Dundonian Scots)

One that runs 4 voluntary language switching blocks of 40 trials, where the participant chooses the variety of production for each trial.

One that runs 40 trials in a single language block for Standard (Scottish Standard English).

The order of Single/Voluntary blocks is determined using the Experimental Tree.

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