Cortical BOLD

Cortical BOLD refers to blood-oxygenation-level-dependent signals measured in the cerebral cortex via functional magnetic resonance imaging (fMRI). In the context given, it describes how cortical fMRI responses vary as a function of stimulus intensity—growing nonlinearly and steepening at high stimulus levels while tracking perceived magnitude (e.g., loudness) in characteristic ways.

Claims that use this term

• Cortical BOLD responses grow nonlinearly with sound intensity, steepening at high levels
• Cortical BOLD responses track perceived loudness linearly but show steepening at high levels