Memory in time: Neural tracking of low-frequency rhythm dynamically modulates memory formation.

Area of Science:

• Cognitive Neuroscience
• Neuroscience of Memory
• Auditory Perception

Background:

• Episodic memory relies on temporal information processing.
• The brain's representation of temporal signals and their role in memory remain incompletely understood.
• Environmental rhythms may influence memory encoding through selective attention mechanisms.

Purpose of the Study:

• To investigate if low-frequency environmental rhythms, specifically musical beats, affect memory formation.
• To test the hypothesis that neural tracking of rhythm acts as selective attention, biasing visual information encoding.
• To explore the relationship between neural rhythm tracking and subsequent memory performance.

Main Methods:

• Participants incidentally encoded visual objects synchronized or desynchronized with background music.
• Electrophysiological recordings measured neural tracking of the musical beat during encoding.
• A surprise memory test assessed recall of encoded objects.

Main Results:

• Significant neural tracking of the musical beat (1.25 Hz) was observed during encoding.
• Enhanced neural tracking correlated with better memory for in-synchrony objects compared to out-of-synchrony objects.
• Rhythm perception influenced memory encoding and retrieval.

Conclusions:

• The brain spontaneously tracks low-frequency musical rhythms during passive listening.
• Neural tracking of rhythm is a mechanism supporting selective attention during memory encoding.
• The strength of neural rhythm tracking influences how environmental rhythms impact higher-order cognitive functions like episodic memory.