1) The auditory evoked N1 response becomes attenuated when sounds are self-generated compared to listening to sounds. This is due to forward models in the motor cortex predicting and cancelling out self-generated sounds. 2) An experiment was conducted using MEG to measure brain activity while participants either listened to sounds, or self-generated sounds with or without cues. Greater attenuation of the N1 response and more motor cortex activity was found for self-initiated sounds. 3) The results provide evidence that intention and motor planning affect auditory processing, with more planning for self-initiated sounds linked to stronger N1 attenuation. This has applications in engineering, neuroscience, and understanding disorders like stuttering