The tones reproduced below were used to identify test subjects at the SRI in the 1970s and later the SAIC as part of the Stargate Project. The original sound files were declassified in 1995. These tones are intended for research purposes. Avoid extended exposure to high frequencies.

Psychic Aptitude Frequency for Numbers - 19,668 Hz

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/8a8b7b64-c293-4527-95a9-702a2078d416/0000.mp3

Psychic Aptitude Frequency for Words - 19,540 Hz

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/8a8b7b64-c293-4527-95a9-702a2078d416/0000.mp3

Psychic Aptitude Frequency for Images - 19,548 Hz

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/8a8b7b64-c293-4527-95a9-702a2078d416/0000.mp3

Psychic Aptitude Frequency for Colors - 19,883 Hz

https://s3-us-west-2.amazonaws.com/secure.notion-static.com/6bb172a7-1f4c-4b47-a005-2fc2550c6a61/0001..mp3