Effects of spatial separation with better- ear listening on N1–P2 complex

• Published in: Auris, nasus, larynx nasus, larynx, 2021-12, Vol.48 (6), p.1067-1073
• Main Authors: Atılgan, Atılım, Çiprut, Ayça
• Format: Article
• Language: English
• Subjects: Acoustic Stimulation; Adult; Audiometry, Pure-Tone; Better-ear listening; Electroencephalography; Evoked Potentials, Auditory; Female; Head-shadow effect; Healthy Volunteers; Hearing - physiology; Humans; Male; Middle Aged; N1-P2 complex; Noise; Signal-To-Noise Ratio; Spatial Processing - physiology; Spatial release from masking; Spatial separation; Speech Acoustics; Speech Perception - physiology
• ISSN: 0385-8146; 1879-1476
• DOI: 10.1016/j.anl.2021.03.005

The purpose of this study was to determine better- ear listening effect on spatial separation with the N1–P2 complex. Twenty individuals with normal hearing participated in this study. The speech stimulus /ba/ was presented in front of the participant (0°). Continuous Speech Noise (5 dB signal-to-noise ratio) was presented either in front of the participant (0°), left-side (-90°), or right-side (+90°). N1- P2 complex has been recorded in quiet and three noisy conditions. There was a remarkable effect of noise direction on N1, P2 latencies. When the noise was separated from the stimulus, N1 and P2 latency increased in terms of when noise was co-located with the stimulus. There was no statistically significant difference in N1-P2 amplitudes between the stimulus-only and co-located condition. N1-P2 amplitude was increased when the noise came from the sides, according to the stimulus-only and co-located conditions. These findings demonstrate that the latency shifts on N1-P2 complex explain cortical mechanisms of spatial separation in better-ear listening.