Figure 1.

Stimuli and behavioral results

(A) Figure examples of stimuli for the low (LN) and high noise (HN) conditions, respectively.

(B) Mean pure tone audiometry thresholds for the young, adult (blue line; N = 20), normal-hearing, elderly (green line; N = 13), and hearing-impaired older listeners across elderly groups (red line; N = 16) in the 250–8000 Hz range. Error bars depict SEM on all graphs.

(C) Forward and backward digit span performance (corresponding to working memory capacity and control) for the three groups.

(D) Mean SNR values were derived from the threshold detection tasks (across LN and HN) from the stimulus individualization procedure.

(E) Mean figure coherence level derived from the first threshold detection task (and employed later in the FG segregation task) for the three groups. Mean Figure coherence level of the LN stimuli for the three groups; significant group differences (p < 0.01) are marked by gray lines above the bar charts.

(F) Mean increase in the background tone number between the tones from LN to HN conditions for the three groups.

(G and H) Behavioral performance (Hit rate and false alarm rate, respectively) in, separately for LN and HN; color labels are at the FG segregation task lower right corner of the figure.