02 FEB 2014 by ideonexus

 Alternative Reason for Age-Related Cognitive Decline

As adults age, their performance on many psychometric tests changes systematically, a finding that is widely taken to reveal that cognitive information-processing capacities decline across adulthood. Contrary to this, we suggest that older adults'; changing performance reflects memory search demands, which escalate as experience grows. A series of simulations show how the performance patterns observed across adulthood emerge naturally in learning models as they acquire knowledge. The simulati...
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The idea that as we grow older, our brains have more information to sort through, which makes it take longer to find the data we need.

24 DEC 2013 by ideonexus

 A Second is Subjective

How many seconds are there in a lifetime? 10^9 sec A second is an arbitrary time unit, but one that is based on our experience. Our visual system is bombarded by snapshots at a rate of around three per second, caused by rapid eye movements called saccades. Athletes often win or lose a race by a fraction of a second. If you earned a dollar for every second in your life, you would be a billionaire. However, a second can feel like a minute in front of an audience, and a quiet weekend can disap...
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Terrence Sejnowski on how a moment of time is a subjective experience that grows longer the more novelty is packed into it.

03 JAN 2011 by ideonexus

 The Net is a Playground of Entropy

It may be fun to surf the Net and follow things randomly, but there's value in structure. The Net is a playground of entropy--the structurelessness that occurs when energy dissipates from a system. Yes, the Net also fosters self-organization, when individuals apply their energy, selectng and filtering information for others (aided by search and filtering tools). But there's rarely uch internal structure to what's selected; the structures created by links are usually webs of cross-references r...
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The net is information entropy in the way things are associated, without strong semantic connections, but mere relations in links.