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Participants in these tests were presented with three kinds of stimuli, all contained within video clips. The fi rst set of images showed a hand grasping a cup against an empty background using two different grips. ” sults demonstrated not only that they do but also that the mirror neuron system responded strongly to the intention component of an act. Test subjects observing the hand motor acts in the “drinking” or “cleaning” contexts showed differing activation of their mirror neuron systems, and mirror neuron activity was stronger in both those situations than when subjects observed the hand grasping a cup without any context or when looking only at the place settings [see box on opposite page].
To detect the 21-centimeter signal, observers will have to overcome numerous challenges. Low-frequency radio broadcasts on earth have to be filtered out. Even more difficult will be dealing with foreground radio emission from our galaxy, which is 10,000 times more intense than the signal from the epoch of reionization. Fortunately, the galactic noise is roughly the same at slightly different wavelengths, whereas the signal fluctuates with wavelength, reflecting the spatial structure of the ionized bubbles.
Then the kinetic and spin temperature began to fall faster than the photon energy (b). After a while, the spin temperature returned to equilibrium with the photon temperature (c). Finally, stars and quasars warmed the gas, pumping up the kinetic and spin temperatures (d). The relative temperatures determine how (and whether) the hydrogen can be observed. Temperature (kelvins) The kinetic energy, photon energy and spin energy were three reservoirs that interchanged energy by various means. 1,000 Background radiation 100 Atomic spins 10 0 a 106 b c 107 Atomic motion d 108 109 Time (years) Since the start of the Dark Ages, the universe has expanded in size by a factor of 1,000, so a 21-centimeter photon emitted at that time arrives on earth with a wavelength of 210 meters.