In Sonic Virtuality, Tom Garner and Mark Grimshaw posits a new definition of sound based around emergent perception. Suggesting that the origin of sounds are placed firmly within the perceiver’s auditory cortex and thus completely imaginary. Physical phenomena are merely stimuli in conceiving a sound and in fact are meaningless without the imagined context placed on the sound inside our brain. Auditory hallucinations and active sound imagination are touched on considering how these also constitute sounds under their definition. The concept is further explored in the imaginary world through computer game and virtual reality sound design, discussing the effect this has on the emergent perception of sounds and emotions of the player. Before concluding with how the theory and research can be furthered with the development of new technology such as in neuroimaging. This is where the neural pathways of a person is mapped over time meaning the auditory experience perceived by a person can be relived. Leading to how this can be developed and used in producing more precise virtual environments and sound design in games to create an even more immersive experience.