Ah yes, that's the patent I was looking for, upvotes all around :). I mistakenly googled for 'heartbeat' instead of 'breath', for which only the GigaOM article turned up.
"The average respiratory rate for adults is 12-20 breaths per minute, which is the rate that the sleep-indicator light fades in and out on most Apple laptops. Older models such as the Macintosh PowerBook, however, use a blinking LED indicator, with discrete pulses in one-second intervals.
The other day, I noticed that my friend’s Dell laptop had a similar feature but with a shorter fade-in-fade-out period. Its rate was around 40 blinks per second, or the average respiratory rate for adults during strenuous exercise not very indicative of something in sleep-mode."
"The average respiratory rate for adults is 12-20 breaths per minute, which is the rate that the sleep-indicator light fades in and out on most Apple laptops. Older models such as the Macintosh PowerBook, however, use a blinking LED indicator, with discrete pulses in one-second intervals.
The other day, I noticed that my friend’s Dell laptop had a similar feature but with a shorter fade-in-fade-out period. Its rate was around 40 blinks per second, or the average respiratory rate for adults during strenuous exercise not very indicative of something in sleep-mode."
http://floodmagazine.com/2010/10/14/apples-attention-to-deta...