Internal perceptual noise rises as signal-to-noise ratio falls.

Evidence

It was shown that the internal noise increased with decreasing SNR. This could be incorporated in the model using an SNR-dependent random process in the decision stage (instead of SNR-dependent templates). — Dijk, Pim van, Physiology, Psychoacoustics and…, 5575

Categorization

• XREF: The ‘internal noise baseline’ here parallels the within-listener reproducibility floor discussed alongside perceptual distances; relevant to the reading-goal interest in how cognition and physiology jointly set perception limits.