This applies not just to sinusoidal curves, therefore; but to large classes of curves showing oscillations.
His first recording of a human EEG was made in 1924 using a galvanometer, but his results were very crude and showed small, undefined oscillations.
For example, neuronal activity generated by two populations of interconnected inhibitory and excitatory cells can show spontaneous oscillations that are described by the Wilson-Cowan model.
It shows statistically significant oscillations matching the Milankovitch cycles with periods of 96,000, 127,000, 405,000 (all are orbital eccentricity cycles), and 1,2 million year (obliquity cycle).
For films with multiple layers, X-ray reflectivity may show oscillations with wavelength, analogous to the Fabry-Pérot effect.
Data collected by Kepler is also being used for studying variable stars of various types and performing asteroseismology, particularly on stars showing solar-like oscillations.
They're more intense and they show finer oscillations than I've ever seen.
Mann wanted temperatures of individual years showing differences between regions, to find spatial patterns showing natural oscillations and the effect of events such as volcanic eruptions.
The pineal gland is considered a secretory organ and its activity shows circadian oscillations.
'Paltry and Conflicting Data' At Brown University, Dr. John Donoghue found that when a monkey is preparing to make a purposeful move, its brain shows oscillations.