In past updates I suggested that the first applications of artificial intelligence would occur in the stock market, because mutual funds and hedge funds would fund the development of the required AI to beat the market. Of course these investment companies would not make their applications of AI public because that would either discount their value or make the government take action to remove these obvious advantages over the average investor.
But I believe that their trail is obvious if you look at a chart of the S&P 500 for the last five years. You will see that the character of changes in the S&P 500 have changed dramatically in recent years. Both the percent of change and the velocity of change have increased versus earlier periods. You can look at this on either a linear or log chart and you will see the same thing. Note Oct 19, 2014; Aug 16, 2015; Oct 4, 2015; and Jan 4, 2016.
This is not enough data to conclude that this is statistically significant to a 95% confidence level, but it is getting close. And it certainly is worth watching.
As I have said before, I would not try to play the general market with what is going on. Buying a specific stock for its growth potential may be valid. But in my opinion, the overall market is now being largely influenced by AI programs.