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Competing Sound Sources Reveal Spatial Effects in Cortical Processing

Figure 2

Spatial performance patterns are diverse across neural recording sites.

(A) The performances of four example sites that vary widely. The performance is color-coded and percent correct value shown for each spatial configuration. (B) The performances of all neurons at all spatial configurations as dots. The translucent gray shows the “upper envelope”—that is, the surface defined by the best performance across neural sites for each spatial configuration. The best-performing six sites are color-coded so that all the dots of one color show performance for that site for all tested configurations. The order of the colored dots changes across spatial configurations, showing that the diversity of the spatial performance patterns is important for allowing good performance across all spatial configurations. The results shown are for the responses at an SNR of −6 dB; that is, the target sound had half the amplitude of the masker. Recordings were made in both hemispheres and data shown here use the electrode hemisphere as a reference, rather than an absolute left/right coordinate system.

Figure 2