With Western children spending more than six hours per day sat in front of a screen, Baroness Susan Greenfield told the Gartner Identity and Access Management Summit it's no coincidence an increasing number of children are today being treated for attention-deficit hyperactivity disorder.
The brain is susceptible to being reshaped by our experiences, she said, citing a recent study where London cabbies who memorized the streets of the capital displayed significant growth in the hippocampus - an area of the brain connected with memory.
Describing the online world, Greenfield added: "You are living in a child-like world of actions and sensations that do not mean anything other than what you see is what you get.
"Screen thinking is strongly sensational, short in span, has no conceptual framework, no metaphors and favors process over concept."
Greenfield said that relationships forged in the "computer world", through social networks and multiplayer environments such as Second Life, are "intruding on the full spectrum of human relationships".
"Autistic people are very comfortable in the computer world because relationships do not depend on the tone of the voice, body language, or pheromones.
"It is literally what you see is what you get.
"I wonder that given the malleability of the brain, whether this is responsible for the rise in autism."
Unless action is taken our sense of personal identity will be replaced by the false identities of social networks or the collective identities on Wikipedia, or be destroyed altogether by a fixation on the quick rewards of the internet, Greenfield said.
This article was originally posted on silicon.com.