Pitch Memory in Nonmusicians and Musicians: Revealing Functional Differences Using Transcranial Direct Current...

Area of Science:

• Neuroscience
• Cognitive Science
• Auditory Perception

Background:

• Memory for relative pitches is crucial for music and language processing.
• Previous functional imaging studies indicate a complex neural network underlies pitch memory.
• The supramarginal gyrus (SMG) has been identified as causally involved in pitch memory for nonmusicians.

Purpose of the Study:

• To replicate the causal role of the supramarginal gyrus (SMG) in pitch memory.
• To investigate the specific functions of the left and right SMG in pitch memory for both musicians and nonmusicians.
• To examine the SMG's role in processing varying memory loads for pitch sequences.

Main Methods:

• Employed cathodal transcranial direct current stimulation (tDCS) over the left SMG, right SMG, or sham condition.
• Participants included both nonmusicians and musicians.
• Tasks involved pitch recognition, pitch recall, and a visual memory control task.

Main Results:

• Cathodal tDCS over the left SMG significantly impaired pitch memory performance in nonmusicians.
• In musicians, left SMG stimulation had no effect, while right SMG stimulation impaired pitch recognition.
• Performance degradation increased with longer pitch sequences, suggesting SMG involvement in higher memory loads.

Conclusions:

• The supramarginal gyrus (SMG) plays a causal role in pitch memory, with distinct functions for its left and right hemispheres.
• These hemispheric functions differ between musicians and nonmusicians.
• The SMG is critical for maintaining pitch information, particularly under increased memory load.