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Description
This study investigates the potential of decoding spatial auditory attention using biosignals, specifically the vestigial postauricular muscle reflex (PAMR) and eye movements. Surface electromyography (EMG) using dry electrodes and eyetracking were recorded concurrently while participants were exposed to acoustic stimulation (broadband noise and narrowband sine bursts) across nine spatial locations and four sensation levels. Results reveal a functional difference between the two systems. The PAMR acts as a rapid, orienting mechanism that strictly requires high-intensity, broadband acoustic energy to trigger a robust spatial gradient, actively suppressing frontal and narrowband targets. The eye movements exhibit a lateralized orienting response that is more robust across all tested spectral conditions.