This is how Makuta uses the Cortical Pyschic Patch on Cadance goes in The Storm of Dark Friendship.
[Makuta puts one end of the patch on his head]
[Makuta approaches Cadance with the patch]
Princess Cadance: What are you doing?
Twilight Sparkle: Leave her alone.
Makuta: Don't worry. If her mind doesn't survive, you will be next.
[He places it on Cadance's horn]
[He approaches the princesses]
[He sees the code on the screen]
Umarak the Hunter: Ah, the code.
[Princess Cadance looks at Twilight and nods]
Twilight Sparkle: Is it me or have the spikes on the tips of your horns grown?
Umarak the Hunter: Quiet! I'm trying to listen.
[He continues listening]