Virtual reality: 5 terms you need to know

Virtual reality is finally starting to hit the prime time, with the Oculus Rift taking Best of Show at the Consumer Electronics Show and Sony unveiling its own headset, Project Morpheus, at the Game Developers Conference this week.

This isn’t the same virtual reality that flopped big in the 90s. Today’s headsets benefit from the mobile wars “peace dividend” — cheap, lightweight, high-resolution screens and motion sensors. Combining the two, together with today’s fast processors and high-end graphics, and you get a virtual reality environment that actually feels real.

And folks who write and talk about virtual reality are throwing some phrases around that might be new to the average reader. Here’s a list of the top ones, what they mean, and why they’re important to making virtual reality actually feel real.

Field of view

Old-school virtual reality headsets gave you a small 3D image that floated somewhere in front of your head — kind of like looking at something through a telescope. The reason? These headsets had a field of view of 45 degrees, or even smaller.

(Image courtesy OculusVR.)

(Image courtesy OculusVR.)

It kind of feels like you’re looking at a television screen hanging out there in space in front of you. And, in fact, that’s how most existing head-mounted displays have been used for so far — to show movies. These devices are expensive, and primarily targeted at people who fly a lot and want to lean back and watch their movies on a fancy headset that shuts out everything around them.

The Oculus Rift and Sony’s Project Morpheus both have a wide field of view.

(Image courtesy OculusVR.)

(Image courtesy OculusVR.)

The Oculus Rift clocks in at 110 degrees, Sony’s Project Morpheus is at a still-respectable 90 degrees. What this means is that the virtual environment is all around you, including your peripheral vision.

Latency

In real life, if you turn your head in one direction, then in another, you’ll see different things. With old virtual reality headsets, no matter how much you turned, you were still seeing the same thing. Specifically, that screen hanging in space in front of you. Since real life doesn’t work that way, your brain is never fooled into thinking you are somewhere else.

But if you have the view shift at the same time as your head moves, then you’ve really got something.

Click image to watch full YouTube video.

Click image to watch full YouTube video.

That why, if you’ve ever seen videos of people trying the Oculus Rift on for the first time, they immediately look around and up and down.

It’s super impressive. You look up, and you see the ceiling — or the sky, if you’re outside. You look down and you see the floor or the ground, or your character’s feet if the game designer bothered to build that in for you. You can even spin around and see who’s sneaking up behind you.

The better the latency, the more immediately the device responds to your head movements, and the more realistic it feels. Plus, whenever there’s a disconnect between what you see and what you feel, there’s an opportunity for you to get nauseous. It’s your body’s way of saying, “Everything is starting to look weird. You must have eaten something poisonous — you need to vomit, right now!”

Other ways of making the display more responsive include using faster screen technology, such as the OLED displays that replaced the old LCD screens in the most recent Oculus Rift “Crystal Cove” prototype, now available for order for $350. The latest version also uses “low persistence” which means that pixels are turned off quickly, helping eliminate motion blur.

Spatial audio

And speaking of things sneaking up behind you — this is where spatial audio comes in. With the right audio headset — sold separately from the Oculus Rift or Project Morpheus — you can get surround sound in your virtual world.

Sound effects that seem to be coming from the side or from behind you are a nice touch for movie theaters or traditional video game setups, but when combined with virtual reality the effects are really impressive.

Scary noises come from behind to frighten PewDiePie as he plays the horror game "Alone" on the Oculus Rift.

Scary noises come from behind to frighten PewDiePie as he plays the horror game “Alone” on the Oculus Rift. (Click image to watch video.)

There’s a whole category of Oculus Rift games that takes advantage of this effect, with spooky sounds coming at you from all directions.

Presence

We humans place ourselves in the world mostly through sight and sound. If you get these right, it’s easy to trick the primitive parts of our brains into thinking that we’re somewhere else.

Virtual environment designers can add to this sense of presence by creating virtual bodies that respond in sync with our movements, or in-world mirrors that reflect our images.

Even very simple virtual environments, like Second Life on a computer screen, can help create this effect. So, for example, users put as much space between their virtual avatars and other avatars as do they between themselves and other people in real life. And memories of virtual encounters are stored and recalled as if they happened for real.

Surfing in Club One, a virtual fitness center in Second Life. Program participants lost weight -- even though the program was purely virtual.

Surfing in Club One, a fitness center in Second Life. Program participants lost weight — even though the program was purely virtual.

 

In fact, when personalized avatars do something it can affect the users in real life — having avatars exercise can increase actual physical activity, and having a taller avatar can increase confidence in face-to-face negotiations. It’s called the Proteus Effect and it can be very powerful.

Because of the feeling of presence, virtual reality is already being used to treat phantom limb pain, PTSD and phobia. As the technology improves, the applications are going to expand dramatically.

Immersion

You know the feeling — you get so caught up in a book or movie that you forget where you are.

Well, the virtual reality combo of a wide field of view, low latency, spatial audio and presence turns up the feeling of immersion to 100.

You feel that you are actually there. In the video game. In the architectural simulation. In the historic recreation. In whatever environment you’ve loaded up.

If it’s a multi-player environment, you feel that you are there with other people.

In fact, the feeling of immersion can be so strong with virtual reality that it can be used as an anesthetic, as with burn victims.

Soldier gets treatment for burns while in a winter-themed virtual reality game. (Click image for video.)

Soldier gets treatment for burns while in a winter-themed virtual reality game. (Click image for video.)

There is, of course, a downside to immersion. The more immersed you are in a virtual environment, the less aware you are of your actual physical surroundings. While good for burn treatments or CAT scans, this can cause problems for people using virtual reality in shared spaces, such as offices, public transport, or busy homes.

In addition, it requires a complete re-thinking of user interfaces, since you can’t see your keyboard once you’re wearing an Oculus Rift or Project Morpheus headset. And if these headsets did allow for some local visibility, it would break the whole point of immersion.

maria@hypergridbusiness.com'

Maria Korolov

Maria Korolov is editor and publisher of Hypergrid Business. She has been a journalist for more than twenty years and has worked for the Chicago Tribune, Reuters, and Computerworld and has reported from over a dozen countries, including Russia and China.

  • AviWorlds

    Human beings are VISUAL beings. So yeah this tecnlogy will help alot of people. I was wondering if it could help blind people. Some sort of direct feeding into the brain. Anyway yes vietual reality once its seen by the human eyes is really accepted by our brains as reality and the only part that it does not fool is our consciousness. We know before we submerged into it that it is virtual. But if we are not conscious about it i wonder what we would really believe? Like in the movies who knows? A good example lets say you want to re-encounter someone you lost and loved…you can be made unconscious and have that experience happen and you would believe it! Right into our sub conscious.

  • this may help us redefine what we think is real. we “think” that what we see and hear is real, but is it?

    when i look at a field of clover in bloom, i see white flowers. A bee sees deep blue flowers because she can see into the UV part of the electromagnetic spectrum

    if i was around an elephant, i couldn’t hear it speaking because human ears can’t hear their low frequencies

    and if i’m aboriginal Australian, i might think all of this is a dream, a concept that Nobel laureate physics scientist do not dismiss

    not too long ago, subquarks were thought to be virtual quantum particles that only existed because we expected them to!

    • Bruce Thomson

      Good post, Erner. Now, in the first sentence, tell me what YOU meant by the word ‘real’. I’m not joking, I’m just plain asking. My own definition of what is ‘real’ is ‘what seems to be consistent with other somewhat tested and verified things’. By the way, thanks to your tip, I searched for elephant talk, and enjoyed the YouTube video about that. https://www.youtube.com/watch?v=YfHO6bM6V8k Bruce Thomson in New Zealand.

  • I think you mean “spatial audio.” Spacial is a brand name.

    • I do, I do mean “spatial.” (It actually took me two tries to type that, though! My fingers just don’t want to go that way!) I fixed the article. Thanks!