BKB Speech-In-Noise, Narrow-Band-Noise, Modified Token

PI Name: Vincent Schmithorst, PhD

Email: Vince.Schmithorst@cchmc.org

Areas: Auditory Cortex and others

Program: Presentation

Duration: 7:30 for BKB_SIN and Token, 5:00 for NBN

Special Equipment: ER-30 insert headphones, Headroom Amplifier, Turtle Beach Sound Card

Description: All tasks use the HUSH paradigm (silent scanner intervals for paradigm presentation). Each stimulus presentation interval is 5s. Stimulus order is randomized at run-time for Modified Token and BKB_SIN.

BKB Speech-In-Noise: Speech is presented over four-talker babble at varying degrees of SNR: 21dB, 12dB, 6dB, and 0dB. Narrow-band noise with center frequency 500 kHz and 1 kHz is used for a "control" task.

Narrow-Band-Noise: Silent control periods alternate with auditory stimulus periods. Each stimulus period consists of narrow-band-noise at center frequencies of 250 Hz, 500 Hz, 1 kHz, 2 kHz, and 4 kHz (1 s each for a total of 5 s).

Modified Token: The subject sees an arrow move and touches two "tokens" (e.g. a large green square and a small white circle). The subject hears "touched the large green square and the small white circle" (for a correct "simple" trial), "touched the small white circle after the large green square" (for a correct "complex" trial), and there are also incorrect sentence presentations. The "control" task consists of the subject seeing the arrow move but hearing a 440 Hz beep.