"Although, no difference was found between identifier styles with respect to accuracy, results indicate a significant improvement in time and lower visual effort with the underscore style. The interaction of Experience with Style indicates that novices benefit twice as much with respect to time, with the underscore style. This implies that with experience or training, the performance difference between styles is reduced."
One main difference is that subjects were trained mainly in the underscore style and were all programmers.
чот странный стади, хоть бы поровну отобрали