The other day i was listening to some Gamma Binaural Beats to help me with my homework, after about 10 minutes i took out my headphones and stopped listening to them, but then i realised that there was a swirling sound in my ears sort of like (VOOM VOOM VOOM) this did not cause me to feel unstable in anyway but it did last for about 15 minutes.
Does anyone know what this might be and why it happens