Syncmaster sa950 ls27a950

The experimental task was coded in Presentation software (version 16.1, www.neurobs.com) and delivered via a Samsung monitor (SyncMaster SA950_LS27A950, 27 inches, 1,920 × 1,080 pixels, 120 Hz refresh rate). In audio settings, the Presentation mixer mode was DirectX. The auditory pacing signal was synthesized in Audacity (version 1.34-beta, Audacity Team, 2018 ) at 750 Hz and 75 ms in length. The auditory pacing signal was presented via Sennheiser headphones (HD 280 pro) with up to 32 dB ambient noise attenuation. Vocalizations were recorded (eight bits, two channels, 48 kHz) via an external Shure microphone (version WH20XLR) positioned two cm from each participant’s mouth. The microphone signal was amplified by an ART Tube MP Pre-Amp. Vocalizations were identified via the sound response device in Presentation software, which detected a response when a sound passed a minimal threshold (set to 0.04 on a zero–one scale). This scale represents a percentage of the maximum sound recording level. Finger taps produced by the right index finger were recorded via a Cedrus RB-830 button box. Participants were seated approximately 80 cm from the monitor.

The experimental task was controlled in Presentation® software (version 16.1, www.neurobs.com) and was delivered via Samsung monitor (SyncMaster SA950_LS27A950, 27 inches, 1920 × 1080 pixels, 120 Hz refresh rate). Vocal-responses were sample at 48 kHz via an external microphone placed within 2 cm from each subject's mouth. Manual-responses involved a key press on a button box; Participants were seated approximately at 80 cm from the monitor.