Mental Alertness (2) called Zanshin (2) (残心・弐 Zanshin Ni) in the Japanese version and also called "Mental Awareness" in Street Fighter X Tekken, is a move introduced to Jin Kazama in Tekken 5. This move lets you do four other moves, even a wavedash. There's also a simmilar move based on this move called "Zenshin" with the inputs d+1+2, which is first introduced in Tekken Tag Tournament 2.

Inputs: b+1