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...

 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...

 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...