Well... Thanks to our tragedy loving culture, anything and everything negative that can be attributed to Video Games has been reported and exploited and that gives rise to questions like this. To be honest Video Games have plenty of positive effects on the people who play them. There is the obvious things. Like reflexes, and I suppose "Hand-Eye coordination." Some games, mostly the older generations mostly the 16-bit era, require a lot of quick movement and close attention to detail. I guess the best way to answer this would be to break it down into eras and machines.
Once upon a time...
The 8-bit era, the Famicom/NES and basic computer systems. Since I am not doing a history of Video Games, I am going to start here because this is when Games were featured in most homes. Most games they’s days were arcade ports, so it was all about high scores and quick button pressing. While on the PCs Sierra Games and games like them were promoting a lot of thought and puzzle solving. In both cases there are benefits, on the consuls you have the benefit of reflexes and on the PCs you actually had to think to solve some of the graphic/text puzzles that were presented to you and in both cases it was fun. It was a pleasant destruction from the world around you. Most of tokays gamers started around this time so we were all pretty young (In my case I was just being born but... moving on)
The 16-bit era, and FPS ruled the PCs
Now that flash was being added to games, they were still about button mashing but some new games were showing up. Maturing with ita original audience, Sim games were showing up on PCs and Consuls and that taught things like how to run a city (Sim City 2000) or on a lesser level keeping ancient civilizations at bay (Actraiser) or on PC maintaining an effective Heaven and Hell (Afterlife) and more PC adventure games. But also games like DOOM and Wolfenstein were showing up and adding to the attention to detail and quick reflexes aspect. In this area of gaming it just added to the positive effects of the previouse era but technology advanced and so did the games. RPGs were showing up in greater numbers and that introduced, thanks to companies like Square and its then rival Enix stories that were worth experiencing and even to I don’t feel it was a good substitute kids who did not read at all go their reading in using they’s games. And like before it was a decent escape from the day to day blah of real life.
32/64-bit era, the boom of Sony, RPGs and the line between PCs and Consuls blur.
In my opinion this is a huge transitional period for gaming and their impact on culture. They become more violent because on a technical level they are again maturing with their original audience. This means that new gamers are being exposed to something older games had x-amount of years to build up to. What are the benefits of this? It’s a mixed bag. Games became more cinematic and generally more accepted in pop-culture. More wide spread and because of this people started to think they were bad. Mindless distractions that do nothing but make kids violent and cause people to blow things up. Not true. It is true that they got more violent but due to the woes of life and the insertion of the original gamers in to the "real world" this acted as more of a stress reliever then ever. Now games are starting to cost more to make, the stories got better... and the graphics improved. They are at the point where as long as its just not mindless trash software, and it dose exist in consuls and on PCs Games can have the same benefits as a good book or movie.
The 128-bit era and beyond.
Today, nothing much has changed. Consuls are more like PCs and thanks to Nintendo games are more then just, well, games. Titles like Big Brain Academe on the DS promote critical thinking and, speeking of the DS almost every puzzle game require lighting fast reflexes. Square-Enix is always developing games with almost Hollywood quality stories. Games like RPG Maker are all about creativity. Even bit of scripting and some math. Sim games or the more recent flood of "Tycoon" games, namely the Roller coaster Tycoon games on the PC allow you to micro manage a business and you also learn a little about physics and how roller coasters and other carnival rides work. Now my friends and I cant go to a theme park without obsessively going over all the stats of the ride, speed, length, and even when you experience pos and neg G's... This is all things I learned from video game.
Fact is that games are becoming more and more complicated and real every day. You can learn a lot or just emerge yourself in a good story. If you want to manlessly kill you can go online ad play an online FPS. This promotes communication, not just communication but global communication.
In conclusion although in the hands of someone who is unstable a game can promote negative behavior the benefits way out number that. All you have to do is sit back and really look at it, and ignore the media. I have been gaming for years, almost 20 years and it has never driven me to kill or hurt anyone. It did not make me lazy or anything like that. In fact it inspired my dream, and that is to be an animator and/or artist. I hoe that helped.
TC