In this 1950 essay, Alan Turing contemplates the question of whether machines can think. Turing quickly acknowledges that this question is very difficult to answer because of the philosophical debates associated with figure out exactly what should be considered a machine, but, more importantly, what it means to be able to think. He was not as interested in conquering the philosophical challenges associated with the question, but rather the practical matter.
So Turing devised a test, now called the Turing test, which aims to determine a more concrete question: Can a computer fool a person into thinking it is a person. The test works by a person asking a series of questions to which the computer and a second person respond. The person asking a question then decides which answer it believes comes from the human and which comes from the computer. If the person guesses answers incorrectly just once, the computer wins.
Turing then expounded on this theory, suggesting that since digital computers operate in a universal binary language, if one computer can fool one person, then all computers can think.
My guess is that since Turing published this article in 1950, there have been significant advances in artificial technology. The test now should involve a panel of dozens of humans and one computer that needs to convince the questioner that it is the actual person.
This is most relevant today in the form of online "customer service representatives" and automated call center "operators." For example, when I go to the Sprint website, I am frequently "approached" by a representative who initiates an online chat session with me asking if I need any assistance making a purchase or researching calling plans. Another example is when I call Amtrak to book or change tickets to travel home from New York. I always speak to Julie, Amtrak's automated assistant, who asks me basic questions that are meant to be answered in several predetermined phrases. I know that Julie is an automated computer because she "tells" me right when I call, and because her voice is so "sterile," but I never know whether these online "representatives" for various companies are real or not.