Brain dynamics of memory encoding for simple versus complex musical sequences
Memory encoding is the foundational process by which the brain transforms sensory input into lasting representations. While the neural mechanisms of auditory memory have been extensively studied, how musical complexity modulates the neural activity during memory encoding remains poorly understood. Here, we used magnetoencephalography (MEG) to investigate the encoding of simple (tonal) versus…
Memory formation is the process by which the brain converts sensory input into persistent representations. Although auditory memory neural mechanisms have been studied, the impact of musical complexity on memory encoding remains unexplored. Employing magnetoencephalography (MEG), researchers examined the encoding of simple (tonal) and complex (atonal) musical melodies in 67 participants.
Behaviorally, participants rated atonal melodies as more complex and found them harder to recognize across three testing periods (same day, one day later, and ten days after encoding). Neurologically, distinct activity patterns emerged: simple melodies triggered stronger responses in auditory cortices (both left and right Heschl's gyrus) and cingulate regions (medial and anterior cingulate gyrus).
In contrast, complex melodies activated the left hippocampus more intensively across varying tones. These results suggest that musical complexity influences neural encoding processes from the beginning, with tonal sequences relying on efficient sensory processing and atonal sequences demanding more memory-related recruitment. This research sheds new light on the human brain's encoding of complex auditory information, offering a framework for understanding the neural foundations of memory formation for temporally structured stimuli.
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