Table 1.

Summary of studies which related working memory capacity (via reading span) to fast-acting wide-dynamic range compression (WDRC).

Authors (year)	Number of participants	Participant mean age in years (SD or age range)	Hearing aid processing	Reading span mean score in percent correct (SD or score range)	Recall	Significant hearing aid processing – working memory relationship?
Foo et al., 2007	32	70 (SD = 8)	Fast-acting WDRC	44% (SD = 11%)	Free	Yes
Ohlenforst et al., 2015	26	74 (range 61–92)	Fast-acting WDRC	36% (SD = 11%)	Free	Yes
Davies-Venn and Souza, 2014	28	65 (range 21–89)	Fast-acting WDRC	79%∗ (SD = 14%)	Free	Yes
Souza and Sirow, 2014	27	82 (range 62–100)	Fast-acting WDRC	34% (range 17–50)	Free	Yes

^∗Administered with participant-controlled timing (Conway et al., 2005).