Ridgewell and their team found these results out of the meta-analysis of 19 studies:

• there is some support for the theory that taVNS (Transcutaneous Auricular Vagus Nerve Stimulation) improves response inhibition, particularly as tasks increase in difficulty.

• taVNS does not have a consistent effect on attention shifts/selection.

• taVNS does not have a substantial amount of evidence when it comes to supporting memory.