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Additional Information

Competing Interests

The authors declare they have no competing interests.

Author Contributions

Zacharias Vamvakousis conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper.

Rafael Ramirez conceived and designed the experiments, contributed reagents/materials/analysis tools, wrote the paper.

Human Ethics

The following information was supplied relating to ethical approvals (i.e., approving body and any reference numbers):

Parc de Salut MAR - Clinical Research Ethics Committee” has reviewed and approved the clinical study entitled: “A Low-Cost Auditory Multi-Class Brain Computer Interface based on Pitch, Spatial and Timbri Cues” under the reference number: 2013/5459/I

Grant Disclosures

The following grant information was disclosed by the authors:



This work is supported by the Spanish TIN project DRIMS (TIN2009-14274-C02-01). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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