[os-ja]

Yes, it is possible to use your thumb to pluck the strings of a bass guitar. Many famous bass players such as Marcus Miller and Victor Wooten use their thumbs for some or all of their playing. However, it takes time and practice to develop the speed and precision needed to play at high levels using this technique. It is also important to note that plucking the strings with your thumb can lead to a warm, rounded tone, but it might not be as clear and biting as using a plectrum (plex).