Table 3.

Proportion of different error types for the 10 PA and 10 SD cases

Error type	Patient type	HFRa	LFRa	HFEa	LFEa	Totalb
Omission errors
	PA	0 (0)	.017 (.017)	0 (0)	.038 (.017)	.021 (.034)*
	SD	0 (0)	0 (0)	0 (0)	0 (0)	0 (0)*
LARC errors
	PA	.017 (.017)	.096 (.052)	.248 (.092)	.268 (.042)	.198 (.111)*
	SD	.31 (.098)	.142 (.056)	.36 (.107)	.547 (.054)	.434 (.203)*
Visual errors
	PA	.213 (.066)	.365 (.081)	.191 (.051)	.288 (.048)	.279 (.152)**
	SD	.139 (.074)	.193 (.07)	.289 (.081)	.17 (.033)	.187 (.128)**
Letter omissions
	PA	.052 (.034)	.161 (.057)	.185 (.074)	.097 (.018)	.122 (.067)
	SD	.028 (.021)	.137 (.069)	.16 (.068)	.074 (.018)	.086 (.065)
Letter additions
	PA	.035 (.019)	.066 (.035)	.008 (.008)	0 (0)	.021 (.021)
	SD	.089 (.05)	.006 (.006)	.022 (.015)	.014 (.007)	.029 (.019)
Letter transpositions
	PA	.112 (.054)	.013 (.009)	0 (0)	.004 (.004)	.024 (.022)*
	SD	.061 (.036)	0 (0)	0 (0)	0 (0)	.007 (.012)*
Letter substitutions
	PA	.332 (.098)	.258 (.076)	.34 (.092)	.166 (.044)	.242 (.07)*
	SD	.177 (.075)	.446 (.075)	.125 (.04)	.117 (.016)	.175 (.051)*
Other errors
	PA	.24 (.129)	.024 (.01)	.029 (.015)	.139 (.034)	.093 (.069)
	SD	.197 (.1)	.077 (.032)	.044 (.021)	.078 (.015)	.083 (.054)

Note: Standard deviations are provided in parentheses. PA = pure alexia; SD = semantic dementia; LARC = legitimate alternative reading of components; HFR = high-frequency regular, HFE = high-frequency exception, LFR = low-frequency regular, and LFE = low-frequency exception.

^aProportion = error type/errors per condition.

^bProportion = error type/total errors.

^*Significant group difference at p < .05, one-tailed.

^**Marginally significant group difference at p < .08, one-tailed.