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Contact with spirit, as Rose describes it, is like experiencing “a high frequency of love.”

Noise-cancelling headphones do have their benefits, particularly for long-term ear health where their soundproofing feature can prevent high frequency and loud noise from reaching and damaging the ear - even while listening to music.

But the high frequencies of white noise can sound harsh.

"But you need high frequency services and then for it to become part of your routine, changing trains is second nature for people that use big city metros."

On a visit to a Texas ostrich farm, the researchers recorded 11 types of calls, ranging from high frequency peeps and gurgles in baby ostriches to low frequency boos and booms in adult males.