2.2. Stimuli
2.2.1. Puretones
Stimuli were 1000-Hz puretones presented binaurally through
headphones at a fixed volume of approximately 60-dB sound
pressure level (SPL). The duration of the tones was 200 ms with a
mean interstimulus interval (ISI) of 560 ms, varying randomly between
480 and 640 ms.