2.5 Statistical analysis
A paired t-test was used to perform within-subject analysis between unaided and aided conditions, and an independent t-test was used to compare the NH and SSD groups. Repeated-measures analysis of variance (ANOVA) was performed to identify significant differences in SNR across Co-located and Separated conditions. Linear regression was used to reveal the relationship between SRTs in the Separated condition and age. Statistical significance was represented as p <0.05. SPSS 26.0 and GraphPad Prism 8.0 were used to analyse data and draw diagrams.