At the age of nine she began to write poetry. She was encouraged to do so by her stepfather. It took her 3 years to write her first song, Brother Mine, it was ready at the age of 14. It was first published on Close-Up Vol. 4, Songs of Family, along with her other early song, The Silver Lady.
Vega hasn't learned to read musical notes, she sees the melody as a shape and chords as colors. She focuses on lyrics and melodic ideas, for advanced features like intros or bridges she relies on other artists she works with. Most of her albums, except the first one, was made in such cooperation.
She claims that 80% of the songs she started writing get finished.
The most important artistic influence on her work comes from Lou Reed, Bob Dylan and Leonard Cohen. Some other important artists for her are Paul Simon and Laura Nyro.
There are several families of algorithms for scheduling spaced repetition:
Neural networks based
Leitner system: 5 stages and an arbitrary number of stages
SM-family of algorithms (SuperMemo): SM-0 (a paper implementation) to SM-17 (in SuperMemo 17)
Some have theorized that the precise length of intervals does not have a great impact on algorithm effectiveness, although it has been suggested by others that the interval (expanded vs. fixed interval, etc.) is quite important. The experimental results regarding this point are mixed.
Sleep timing depends greatly on hormonal signals from the circadian clock, or Process C, a complex neurochemical system which uses signals from an organism's environment to recreate an internal daynight rhythm. Process C counteracts the homeostatic drive for sleep during the day (in diurnal animals) and to augment it at night. The suprachiasmatic nucleus (SCN), a brain area directly above the optic chiasm, is presently considered the most important nexus for this process; however, secondary clock systems have been found throughout the body.
An organism whose circadian clock exhibits a regular rhythm corresponding to outside signals is said to be entrained; the rhythm so established persists even if the outside signals suddenly disappear. If an entrained human is isolated in a bunker with constant light or darkness, he or she will continue to experience rhythmic increases and decreases of body temperature and melatonin, on a period which slightly exceeds 24 hours. Scientists refer to such conditions as free-running of the circadian rhythm. Under natural conditions, light signals regularly adjust this period downward, so that it corresponds better with the exact 24 hours of an Earth day.
The clock exerts constant influence on the body, effecting sinusoidal oscillation of body temperature between roughly 36.2 C and 37.2 C. The suprachiasmatic nucleus itself shows conspicuous oscillation activity, which intensifies during subjective day (i.e., the part of the rhythm corresponding with daytime, whether accurately or not) and drops to almost nothing during subjective night. The circadian pacemaker in the suprachiasmatic nucleus has a direct neural connection to the pineal gland, which releases the hormone melatonin at night. Cortisol levels typically rise throughout the night, peak in the awakening hours, and diminish during the day. Circadian prolactin secretion begins in the late afternoon, especially in women, and is subsequently augmented by sleep-induced secretion, to peak in the middle of the night. Circadian rhythm exerts some influence on the nighttime secretion of growth hormone.
The circadian rhythm influences the ideal timing of a restorative sleep episode. Sleepiness increases during the night. REM sleep occurs more during body temperature minimum within the circadian cycle, whereas slow-wave sleep can occur more independently of circadian time.
The internal circadian clock is profoundly influenced by changes in light, since these are its main clues about what time it is. Exposure to even small amounts of light during the night can suppress melatonin secretion, increase body temperature, and increase cognitive ability. Short pulses of light, at the right moment in the circadian cycle, can significantly 'reset' the internal clock. Blue light, in particular, exerts the strongest effect, leading to concerns that electronic media use before bed may interfere with sleep.
Modern humans often find themselves desynchronized from their internal circadian clock, due to the requirements of work (especially night shifts), long-distance travel, and the influence of universal indoor lighting. Even if they have sleep debt, or feel sleepy, people can have difficulty staying asleep at the peak of their circadian cycle. Conversely they can have difficulty waking up in the trough of the cycle. A healthy young adult entrained to the sun will (during most of the year) fall asleep a few hours after sunset, experience body temperature minimum at 6AM, and wake up a few hours after sunrise.