Table 1.

Metrics used in the literature from January 2005 – January 2012 to report performance of communication-based BCIs

Metrics reported	Number of times reported	Article references
Accuracy	38	[8,27-63]
Accuracy and information transfer rate (ITR)	16	[6,7,64-77]
Information transfer rate (ITR)	7	[78-84]
True and false positives	1	[85]
Accuracy and written symbol rate (WSR)	1	[86]
Accuracy and speed	1	[9]
Accuracy and mutual information	1	[11]
Accuracy and number of errors	1	[87]
Accuracy and selections per minute	1	[88]
Accuracy, bit rate, selections per minute, output characters per minute	1	[14]
Characters per minute	1	[89]
Accuracy, information transfer rate (ITR), NASA task load index, QUEST 2.0	1	[90]