After two days of teasingly tinkering with the Google logo, or "doodle," atop its home page, the California company ended the mystery by unveiling "Google Instant" -- a speedier route to Web search results.

As users type in a query, the Google search box displays a list of suggested terms and displays the actual results for the top suggestion.

"Google Instant actually gets queries and gives you search results as you type and streams those results to your computer," Google vice president of search products and user experience Marissa Mayer said.

"We are actually predicting what query you are likely to do and giving you results for that. There is actually a psychic element to it," Mayer said at a press event in the San Francisco Museum of Art.

Google Instant began rolling out immediately in the United States and would expand to Britain, France, Germany, Russia and three other countries during the course of the coming week, according to Mayer.

Google Instant search works on Chrome, Firefox, Safari, and Internet Explorer 8 software for browsing the Internet.

"We are really excited about what Google Instant could mean in terms of the evolution of search," Mayer said. "We think Google Instant is a quantum leap forward in search."

Google is putting finishing touches on a version of Google Instant for smartphones and other mobile devices and should release it in the next several months, according to Mayer.

"I think this is a piece of an ever-changing landscape of computing," said Google co-founder Sergey Brin. "Things coming out in the next decade from Google and other companies will really change the way we do computing."

Brin joked that he has started toying with saying "Google wants to be the third half of your brain."

As queries are typed in black letters, "auto-complete" software developed by Google engineers in Israel tries to predict the subjects of searches.

"You have to truly use Google and see for yourself to understand the power," Google Instant director of product management Johanna Wright said as she and a colleague demonstrated the new search tool.

"Instant results plus predictions -- when you start typing results display on the screen instantly; there is no need to hit the enter key or the search button," she said.

Brin credited software innovations in-house and faster, cheaper computer chips with making it possible for Google data centers to manage the leap in the amount of data handled by turning each query into an ever evolving query.

"We did have to spend a lot more computer power on it, and it is really thanks to all of those advances in semiconductors and multi-core processors that we can do this," Brin said.

Tests of Instant at Google showed that people quickly adapted to the new style of entering search queries and frowned on going back to the old method.

"We likened Instant to power steering or power braking in cars; once people get used to it, it is hard to go back," Mayer said.

The new tool shaves seconds off searches at Google, which prides itself on the speed with which it finds what people seek on the Internet.

More than a billion people use Google search monthly, meaning that aggregate time saved quickly rockets into thousands of hours daily, according to Mayer.

Search Engine Land website editor Danny Sullivan said Google Instant looked interesting and promised to add an "Oh wow!" effect to using the world's most popular Internet search engine.

"But it might also be annoying when it doesn't get things right," Sullivan said. "I also think it wouldn't be that hard for competitors to copy."

The Google Instant launch comes shortly after Microsoft's rival search engine Bing began handling online queries at Yahoo! Web pages in an alliance aimed at taking on Google.

"I have no doubt that if other search engines see a really good feature they might try to roll it out themselves," Wright said when asked by AFP how Bing might respond to Google Instant.

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