"repeated alternation" is a correct and usable phrase in written English.
It can be used when referring to a pattern of back-and-forth shifts between two things. For example, "After going through a period of repeated alternation between joy and despair, the couple finally decided to end their relationship."
Also frequently heard is the "ting-tang," or repeated alternation of two notes, adopted at St. Paul's Cathedral, London.
We consider three stochastic landscape dynamics: (i) the population is subject to repetitive bottlenecks, (ii) to the repeated alternation of fragmentation and fusion of demes with a constant population carrying capacity, (iii) idem with a variable carrying capacity.
Synonymy of the three genera as ontogenetic stages of a single taxon would require cranial changes otherwise unknown in ceratopsids, including additions of ossifications to the frill and repeated alternation of bone surface texture between juvenile and adult morphotypes.
However, the sound-induced motion on appearance was positive, whereas most contingent aftereffects were negative in direction to the adaptation stimulus: after exposure to repeated alternations of a red contracting spiral and a green expanding spiral, the red stationary spiral appeared to be expanding and the green stationary spiral contracting [12].
The pattern of repeated alternations in paced heart rate, therefore, elicited oscillations in ETCO2, ETO2, and ventilation (Figs. 1 and 2).
To assess the effect of differing magnitudes of heart rate increment, in a subset of five patients, we assessed repeated alternations in heart rate of 10, 20, 30, 40, 50, and 60 beats/min in size.
That observation works well enough for a piece in which blocks of slow and fast activity simply repeat in alternation.
Our results add to their findings by demonstrating the ability to induce oscillations in respiratory parameters (using repeated heart rate alternations).
There was good reproducibility in the response to repeated heart rate alternations within individual subjects (the SE for the ETCO2 response averaged 0.073 kPa, and for ventilation averaged 0.59 l/min).
The average delay between peak ETCO2 and peak ventilation was 21.3 ± 4.7 s. Figure 2 shows an example of data from one subject with heart failure showing baseline measurements of ETCO2 and ETO2 with a stable heart rate, followed by the effect of six repeated 30 beats/min alternations in heart rate with period (cycle time) of 60 s, and then a return to baseline heart rate.
They showed that even when the repetition of the feature value was at chance level (i.e., repetition was not more likely than alternation), repeating a target (but not the response) improved performance.
