These also improved memory and learning, similar to improvements made by environmental stimulation.
In that trial, about 2, 800 elderly participants showed improved memory, reasoning and visual processing speed after playing an earlier version of the Double Decision game, said Dr. Wolinsky, who also worked on that earlier research.
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"Transfer of data between different memory types has improved significantly in recent times, and will be further helped by the standards for hard drives which are currently being developed by the major manufacturers, " said Mr Larsson.
Short term memory also significantly improved.
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Other studies, like the one highlighted in this New Scientist article, have found that some aspects of memory seem to be improved by chewing gum, particularly immediate and delayed word recall, while others are not.
Unlike stimulation for treatment of Parkinson's or other issues, in which the brain is stimulated continuously or repeatedly with an implanted pacemaker-like device, memory in the latest study was improved by a single burst of current when administered in the right location as memories were being formed, according to Dr. Fried.
They also showed that injecting normal mice with extra ghrelin increased the number of synapses in the hippocampus - and improved the animals' performance in several learning and memory tests.
All MacBook Airs were updated with improved processors, graphics, faster flash storage and larger amounts of memory.
Recent animal studies have shown that stimulating the entorhinal cortex improved the growth of brain cells in adult mice and appeared to enhance memory for locations and spatial knowledge.
The cost of making hard drives has dropped and is continuing to do so because of improved technologies so they are proving to be more cost-effective than other forms of memory, he added.
The download manager has been improved and maps are now stored on the phone's SD card (if available) to save valuable phone memory.
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