Alice A. Bailey wrote in her book Light of the Soul on The Yoga Sutras of Patanjali - Book 3 - Union achieved and its Results:
The akashic record is like an immense photographic film, registering all the desires and earth experiences of our planet. Those who perceive it will see pictured thereon: The life experiences of every human being since time began, the reactions to experience of the entire animal kingdom, the aggregation of the thought-forms of a karmic nature (based on desire) of every human unit throughout time. Herein lies the great deception of the records. Only a trained occultist can distinguish between actual experience and those astral pictures created by imagination and keen desire.