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→Common Methods
One thing to watch out for is that you only bending in one direction. IE, you are always pushing the string away from its natural fretted position, or you are always pulling it. If you push up, then don't simply allow the string to return to its natural position but "pull through" that point and begin bending higher in pitch using a pulling technique, there is an artificial sound to the transition. Picture a sine wave - the high and low peaks are rounded off and smooth. When you "pull through", you don't smoothly approach the low peak but blaze through it. This would be like if the sine wave had pointy peaks on the bottom but rounded peaks on top, like a bouncing ball.
===== Finger Vibrato =====
Finger vibrato bends and straightens the fretting finger(s) to bend and release the string.
===== Wrist Vibrato =====
Wrist vibrato rotates the wrist using the index finger knuckle as a pivot point to bend and release the strings.
=== Pushing/Pulling ===
This technique is difficult to master - it feels like you are going to slide off the fret. In this regard, it's very difficult to get a wide/large vibrato from this technique.
The main benefit to this technique is that you are not simply changing the pitch above the original note but above and below it. Thus, the average pitch of the vibrato and original note should be very close. Also, it is possible to apply this technique to chords.
=== Vai's Circle Vibrato ===