How did you do that?!

He's prolly striking the string before the nut, causing a harmonic and subsequently depressing the string at the same nut area to have a slight 'whammy' effect...
 
i watched john mayer playing gravity and he had improvised the solo. he did an ordinary harmonic and pressed the strings before the nut resulting in a wailing sound i tried it but cant get the sustain he does. any idea what effect to use to get that ambient resonating sustained sound? lol so many descriptions!
 
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