Tasks using only voice and video communication
We used voice and video calls for story recall, selective reminding test, PASAT, digit span, similarities (FAB), and word fluency (FAB). The examiner used a laptop PC (LIFEBOOK WU2/D2, 13.3-inch display manufactured by FUJITSU, Japan) with a unidirectional microphone (AT9933USB, manufactured by audio-technica) connected to a webcam (UCAM-C980FBBK, manufactured by ELECOM). The examiner also used Microsoft Groove music and the audio sharing function in Webex Meetings for the presentation of PASAT. Participants used a desktop PC (Gemini X45 manufactured by Beelink) with a 25-inch colour IPS monitor (manufactured by Philips), unidirectional microphone (same as the examiner), webcam (same as the examiner), and headphone (ATH-250 M manufactured by audio-technica). The distance between the participant and monitor was set at approximately 50 cm. Before the experiment began, the examiner checked the volume and adjusted it to a level that allowed each participant to hear the conversation comfortably. The participants did not operate any equipment other than wearing the headphones.