FREQ-NESS Maps Frequency-Specific Brain Networks During Sound Processing
Listening to sound activates the brain, and a new imaging-analysis method aims to show how networks change as different sound frequencies are processed. FREQ-NESS—Frequency-resolved Network Estimation via Source Separation—separates overlapping brain networks by their dominant frequencies and maps how activity propagates across regions. The research may help investigate perception and attention; it does not establish a new diagnostic tool or a theory of consciousness.
What happens in the brain during a steady rhythm or musical tone? Researchers at Aarhus University in Denmark and the University of Oxford studied how ongoing sound relates to rapidly changing patterns of brain activity. Their paper in Advanced Science describes the brain as coordinating interactions among neural networks rather than simply recording each new beep or tone.
Mattia Rosso and Associate Professor Leonardo Bonetti of Aarhus University's Center for Music in the Brain led the work with Oxford collaborators. Their FREQ-NESS method uses algorithms to separate overlapping networks according to frequency, then trace a network's spatial course across the brain once its characteristic frequency is identified.
Rosso said conventional analyses often treat alpha, beta, and gamma waves as fixed channels and anatomical regions as separate units. Earlier research had shown that brain activity is organized by frequencies shaped by internal rhythms and the outside environment; the team designed FREQ-NESS to locate how each frequency is expressed across the brain.
Mapping dynamic brain networks
Unlike methods that begin with predetermined frequency bands or selected regions of interest, this data-driven approach seeks detailed spectral and spatial maps of whole-brain organization. The authors see possibilities for basic neuroscience, brain-computer interfaces, and eventually clinical research, subject to further validation.
The team connects these findings to wider questions about how rhythmic brain activity relates to music cognition, perception, attention, and altered states of consciousness. Bonetti said the brain does more than react passively: it reconfigures its activity, and the method may help researchers observe that process in responses to music and in wider interactions with the world, including mind-wandering.
A larger project backed by an international network of neuroscientists is underway to refine the method. Bonetti said its reported reliability across experimental conditions and datasets raises the possibility of individualized brain maps. Image credit in the original article: online image, with no specific creator identified. Original ScienceDaily report.
