A single peer-reviewed experiment found that click trains with the same average spacing elicited different behavioral and neural responses when their timing patterns changed. Human listeners distinguished the sequences, while recordings in awake rats traced increasing context sensitivity along the auditory pathway. Temporary cortical inactivation also reduced thalamic sensitivity, offering a route to study how higher brain regions shape the processing of rapid sounds.
Human listeners distinguished sequences of brief clicks even when their average spacing remained the same. In a single peer-reviewed experiment, changing the order of the gaps elicited distinct behavioral and neural responses. Holding the average interval constant allowed researchers to investigate temporal patterning rather than simply comparing faster and slower sounds.[1]
Human scalp electroencephalography, or EEG, measured changes in responses to sounds deviating from the expected sequence. Awake rats also showed differences in electrical activity measured at the brain surface. The human experiments supplied behavior and EEG, while more detailed rat recordings followed individual neural units along the auditory pathway.[1]
The midbrain showed little sensitivity to listening context. Sensitivity increased in the thalamus, a relay region, and was more pronounced in primary auditory cortex. Within the cortex, superficial layers showed stronger pattern effects than deeper layers.[1]
Temporary inactivation of auditory cortex reduced the thalamus’s sensitivity, supporting a role for feedback from cortex to thalamus. The circuit intervention was performed in rats; equivalent human cells were not directly measured. These experiments investigate basic auditory processing and did not test a diagnosis or treatment for human disease.[1]
