A young woman starts to become suspicious of her cellphone. She notices it listing Wi-Fi networks she does not recognize, and the photos on her contact cards seem to mysteriously change at random times. One day she tries to make a call and just hears static on the line. She begins to think that someone – or an entire organization – has hacked her phone or placed spyware in it, and she wonders what crime she is being framed for.

Built-in laptop webcams, unfamiliar Wi-Fi networks, targeted ads on search engines and personalized algorithms on social media sites: Most people have come to accept and ignore the quirks and drawbacks of daily contact with the internet and devices such as cellphones and computers. But for people with severe mental illness, new technologies are fertile ground for the start of false ideas that can lead eventually to a break with reality.

Psychiatrists like me help people who are bothered by their thoughts, behaviors or emotional states. For the past 10 years I’ve been working closely with people who have schizophrenia.

Schizophrenia, sometimes referred to as a type of thought disorder, is a chronic condition in which alterations in brain function change the way one perceives the world. People with schizophrenia can become hyperaware of their surroundings, often interpreting........

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