I'd say that's decided by whether they stick around and keep buying games in a variety of genres. So those that regularly buy the consoles and games such as COD, GTA, Halo, Infamous, Zelda etc and keep doing that are not casual. While those that buy only like 1 console or game and are unlikely to ever buy any others are casual.

Nah, Japan is quite tasteless with the same games over and over. PS1 and PS2 aren't off topic as they are Sony consoles just like PS4 is and there is a tradition at work here. As someone on this website you should have noticed this by now.

....remember first year,fat ds...dslite skyrocketed the ds series...and is the main reason that ds dominates 3ds! Let me show you, the lt sales individually!fat ds 18.79m , ds dslite 93.86m, dsi/xl 41.35m(28.43m/12.92m)

YTD 5.6

x2 10.2 + 10.1 = 20.3 million 

so yeah it is possible

Don't know why you have to imply that buying a PS4 means your brainless, but I guess its because of this:

I'd say that's decided by whether they stick around and keep buying games in a variety of genres. So those that regularly buy the consoles and games such as COD, GTA, Halo, Infamous, Zelda etc and keep doing that are not casual. While those that buy only like 1 console or game and are unlikely to ever buy any others are casual.

yeah that was unnecessary  

Japan tasteless ? lol where do you think the awesome JRPGs ,beat em up, adventure etc. games come from ?

I dont know about any tradition ...

Bullshit response. Everyone knows that a lot of casuals bought the wii, but a lot of hardcore gamers did to. The only problem was that those hardcore gamers did not just have the wii, it was usually acompani by a ps3/360 or all 3. People where not going to buy the way more inferior version of a game for wii while they had their other hd console with the wii. But almost all the games exclusive for the wii, hardcore or casual, mainly hardcore, sold preety well. Everybondy know the wii was a great secondary console for hardcore gamers. Only casuals had it as a primary console, or poor people like me, wich I got a ps3 very late in the gen.

Accurate? Not really. Although we can make assumptions based on the sales, PS3 and Xbox 360 continued selling for a much longer period and game sales stayed high throughout the gen. Wii sold really well to start with but dropped off massively, same with Wii game sales.

That doesn't conclusively prove anything but it does suggest there were many more casuals that bought a Wii than a PS3 or Xbox 360 and simply lost interest as the years went on, as casuals would do.