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. 2015 Mar 25;10(3):e0121809. doi: 10.1371/journal.pone.0121809

Table 2. Summary of Level and Stage Design of the Imagery and Mental Arithmetic (MA) Conditions.

Level Stage Key Signature Starting Note No. of arrow with heard tones No. of imagined tones (Imagery) Starting Number for MA No. of arrows for MA Numeral presented with arrow for MA
1 1 C tonic 3 1 1 4 1
2 *C, C#, D, Eb, E tonic *3–4 *1–5 *4–5
3 *C, C#, D, Eb, E dominant *3–6 *1–5 *4–7
2 1 C tonic *3–4 2 1 *5–6 *1–2
2 *C, C#, D, Eb, E tonic *3–5 *1–5 *5–7
3 *C, C#, D, Eb, E dominant *3–6 *1–5 *5–8
3 1 C tonic *3–4 3 1 *6–7 *1–3
2 *C, C#, D, Eb, E tonic *3–5 *1–5 *6–8
3 *C, C#, D, Eb, E dominant *3–6 *1–5 *6–9
4 1 C tonic *3–4 4 1 *7–8 *1–4
2 *C, C#, D, Eb, E tonic *3–5 *1–5 *7–9
3 *C, C#, D, Eb, E dominant *3–6 *1–5 *7–10
5 1 *C, C#, D, Eb, E tonic *3–4 5 1 *8–9 *1–5
2 *C, C#, D, Eb, E dominant *3–5 *1–5 *8–10
3 *C, C#, D, Eb, E *tonic or dominant *3–6 *1–5 *8–11

The Perception Conditions corresponded to the first five columns of the table.

* denotes when a random variable from those listed could be used at that stage. Only the key signature was set so as not to repeat for a concurrent trial.