The phrase "at threshold level" is correct and usable in written English.
It can be used in contexts related to measurements, standards, or limits, often in technical or scientific discussions.
Example: "The experiment was conducted at threshold level to determine the minimum effective dose of the drug."
Alternatives: "at the minimum level" or "at baseline level".
At threshold level k, the pixels are divided into two classes: C0 [background, (1, 2,…, k)] and C1 [foreground, (k + 1, k + 2,…, L)].
Our baseline measurements were all taken at threshold level.
Overall, our findings suggest that spike time precision at threshold level is most sensitive to the EPSC decay time.
Please see: Hummel T, Springborn M, Croy I, Lötsch J (2011) High pain sensitivity is distinct from high susceptibility to non-painful sensory input at threshold level.
EPSC charge and amplitude at threshold level were a function of EPSC shape, with fast EPSCs triggering spikes at high current amplitudes but little charge, and slow EPSCs triggering spikes at low current amplitudes but high charge values.
The fact that these measurements were made at threshold level certainly plays a role, as we will later see that EPSCs with long decay times do yield precise spike timing when their amplitude is increased to above threshold level.
This mapping is however only valid at threshold levels.
However, release of this material does not account for changes in contractile strength associated with changes in frequency of stimulation at threshold levels.
Figure 3 Fwhm timing resolutions for each readout mode with 5mm length and 20mm length LYSO crystals at threshold levels normalized to the amplitude of a single photo-electron pulse for each readout mode.
The sequential opening of mitochondrial channels elicits ROS production that at threshold levels of glutathione redox potential triggers a transition between the physiological and pathophysiological regimes of cardiac mitochondria network dynamics [18], [30].
At threshold levels of depolarization, EPSCs with short decay phase triggered spikes with high temporal precision, whereas EPSCs with a long decay time triggered spikes with poor temporal precision.
