Feasibility and usability assessment
MCI
To assess feasibility of tVNS in MCI, VINCI-AD will assess report the number of participants completing assessment across the three sessions. To assess usability of the device, a modified Kettle test has been designed with senior Occupational Therapy colleagues in our institution (see Additional File 3). The Kettle test is a brief, objective assessment of functional skills [Acceptability of the device will be assessed via Likert-based scale questions including if the device felt comfortable, their subjective sense of confidence using the device, would the participant use it again (See Additional File 4).