They vary from glaring inconsistencies to scarcely perceptible misrepresentation. It has a characteristic high-pitched, highly perceptible hissing sound. Depending on the lighting and camera angle it varied from barely perceptible to prominent. Such insistence on perceptible veracity is clearly incompatible with metaphoric usage. Its speed, although not perceptible to the naked eye, is considerable. This limen is also known as the difference limen, difference threshold, or least perceptible difference. While the appearances are perceptible to the senses, the substance is not. It is significant that at Tangshan there were no perceptible foreshocks. The notice for visually perceptible copies should contain all three elements described below. Achieving much higher compression is simply not possible without discarding some perceptible information. Inevitably, this period also coincided with the start of a very slow but perceptible decline. What substances are there, and are there any substances besides perceptible ones? The base is chosen such that it does not produce a perceptible smell. The incandescent lamps consume no oxygen, and cause no perceptible heat. Nagumo, with a barely perceptible nod, with tears in his eyes, agreed to go.