Impact of Speller Size on a Visual P300 Brain-Computer Interface (BCI) System under Two Conditions of Constraint for Eye Movement

Table 1

Different parameters used in different speller sizes.

Parameters		Size
		Small	Medium	Large
Matrix size (MS)	cm	5.27	9.98	14.69
	inch	2.26	3.92	5.78
Symbol size (SS)	cm	0.42	0.79	1.17
	inch	0.16	0.31	0.46
Symbol distance (SD)	cm	0.55	1.04	1.53
	inch	0.22	0.41	0.61