A series of studies about videogames presented at the just-ended American Psychological Association convention pointed to more positive than negatives. According to an article in the Hartford Courant, researchers suggested that "video games can be powerful learning tools – from increasing the problem solving potential of younger students to improving the suturing skills of laparoscopic surgeons. One study even looked at whether playing "World of Warcraft," the world's biggest multiplayer online game, can improve scientific thinking." A Wired blog on the findings cited one presenter as saying, "The single-best predictor of [a surgeon's] skills is how much they had played video games in the past and how much they played now." It also said gamers of different ages approach videogames differently. For example, younger gamers focus more on planning and problem-solving, while teens focus more on the "here and now." Here's more in-depth coverage from the psychologists at PsychCentral.com. Meanwhile, the Nintendo Wii is still the top-selling game console. Nintendo sold 555,000 Wii systems last month, compared to PlayStation 3's 224,900 units and Microsoft Xbox 360's 204,800, USATODAY reports. Here's the ESRB on "what parents need to know about videogames," courtesy of the Lynchburg (Va.) News & Advance.