The phrase "absence of modulation" is correct and usable in written English.
It can be used in contexts discussing variations, changes, or adjustments in signals, sounds, or other phenomena where modulation is relevant.
Example: "The absence of modulation in the audio signal resulted in a flat and uninteresting sound."
Alternatives: "lack of modulation" or "no modulation present".
This virtual absence of modulation in vivo was captured by our model, as it predicted an attenuated modulation depth during VOR.
The replacement of both VFT1 and VFT2 of the BPSM BvgS by those of RB50 (BPBb1+2) did not affect the level of BvgS activity in the absence of modulation, but it made the recombinant bacteria much more sensitive to nicotinic acid than their parent (Fig. 4B,C).
Whereas 0.50 reflects the absence of modulation, animals free running in DD after beach collection exhibited an MI of 0.77 + 0.04.
Gschwind et al. (54) demonstrated white matter (structural) connectivity between visual processing areas and amygdala, although FG amygdala connectivity was weak (perhaps consistent with the absence of modulation of this connection in the present study).
As expected, our positive control, the MET amplified H1993 cell line, showed high levels of basal and phosphorylated MET and absence of modulation by HGF 40 ng ml−1.
Moreover, the absence of modulation in the 2 hour delay groups shows that the enhanced CCP for the food-paired arm was due to a retroactive enhancement of memory.
Additional research that introduces explicit attention contrasts will be necessary to determine whether incidental presentation of stimuli directly modulates the presence or absence of emotional modulation of the N170.
It is also shown that tuning of correlations to a stimulus or an action might be a direct consequence of variability in that stimulus or action, even in the absence of any modulation of direct inter-neuronal interaction.
We derive the intrinsic period of PING in absence of any modulation: Δ T j I N = 1 ε ln ( g I E I E ) − Ω 0 ε 1 / 3 I E. (26).
Let us consider the case in which constant driving term I E in system (1) is positive and such that, in absence of theta modulation, the EG neuron would fire periodically with a spiking frequency in the gamma range (30 150 Hz).
Although the methods presented do not apply to pilot signals (e.g., GPS L1C) due to the absence of data modulation (synchronizing with any possible secondary code is accomplished using very different techniques [15]), it is acknowledged that a pilot signal could assist with bit synchronization and decode for any data-bearing signal from the same satellite.
