Background: Age-related hearing loss (ARHL) is a common and irreversible condition that has been recently associated with cognitive decline and dementia. Hence, if ARHL is treated earlier, the risk of dementia might decrease. However, in China, only 0.8% of older adults with hearing loss wore hearing aids, and over two-thirds (67.5%) of older adults with ARHL in Hong Kong had either been formally diagnosed or treated. There is also limited information on the feasibility and efficacy of hearing loss interventions for older people in Hong Kong. It is important to develop hearing loss interventions that have the potential to improve cognitive functions among older people.

Aims: This study aims to assess the feasibility and acceptability of a new auditory-cognitive dual-task intervention (ACDT) for community-dwelling older adults with hearing loss, and to examine the preliminary efficacy of ACDT on their cognitive function.

Study design and Methods: This is mixed-model design, using a 2-arm, parallel-group, single-blinded, pilot randomized controlled trial (pilot RCT). A total of 60 community-dwelling older adults in Hong Kong who have mild to moderate hearing loss and normal cognitive performance will be recruited. Participants will be randomly assigned to the auditory-cognitive dual-task intervention group (ACDTG), and control group with no specific intervention (a "wait list" group) (CG). Each ACDTG participant will receive the intervention for 12 weeks (5 days x 60-min sessions per day). All participants in all groups will be assessed for cognitive function (primary outcome), social isolation, and loneliness, and hearing at baseline (T0), and after the intervention (T1). Post-intervention interviews will be conducted to obtain perspectives of participants in the ACDTG on the feasibility and acceptability of the ACDT intervention.

Data analysis: Participant characteristics and outcome variables will be analysed through descriptive statistics. Differences in cognition score and other outcomes across time points among the participant groups will be measured by Generalized Estimating Equations (GEE). The statistical software package IBM SPSS version 26.0 will be used. Content analysis will used to analyse the post-intervention interviews.

Expected results: ACDT will be feasible for implementation and acceptable for community-dwelling older adults with hearing loss. While ACDT will not be able to improve underlying hearing in ARHL, it will be more effective on improving participants' cognitive function, social engagement and loneliness, and ability in information processing, interpretation and communication, than CG.

Inclusion Criteria:

• aged 60 and above living in the community;
• have mild to moderate hearing loss with a pure-tone average (PTA) between 25 and 60 dB in both ears (average hearing threshold at 0.5, 1, 2, and 4 kHz measuring by audiometer with headphones in a quite listening environment, no hearing aid use within the past 6 months;
• with normal cognitive performance (MoCA score ≥26); and
• are willing to and capable of providing informed consent and complying with study procedures.

Exclusion Criteria:

• have a history of psychosis, mania, bipolar disorder, substance use disorder or have current suicidal ideation;
• with severe or unstable medical illness, significant retrocochlear pathology or organic lesion responsible for hearing loss;
• a diagnosis of probable Alzheimer's disease, vascular dementia, FTD, or Parkinson's Disease; and
• taking medications such as antidepressants, sedatives, or antiepileptics that may affect cognition.

Individual deidentified participant data (including data dictionaries) will be shared. The investigators will publish research findings in peer reviewed and international official journals without Individual identifiable participant information according to the ethical requirement. Individual deidentified participant dataset can be shared per request and approved by the research core team.