A neuroimaging study of guitarists found increased activity in the Brodmann area 45 of the brain while they were improvising blues rock sequences. This area is located in the inferior frontal gyrus area of the frontal cortex and is a part of the wider Broca’s area. The research was published in BMC Research Notes.
Creativity is the ability to generate new, original, and valuable ideas or solutions. It involves complex cognitive processes, including divergent thinking, which is the ability to think about many different ideas at once and explore multiple possible solutions. Creatively gifted individuals often exhibit the capacity to make unusual connections, think outside the conventional frameworks, and challenge norms or traditional practices.
One manifestation of creativity is musical improvisation. Musical improvisation is the spontaneous composition of music in real-time. While improvising, musicians perform without specific preparation or pre-composed material, creatively expressing ideas and emotions through their instruments or voices.
The neural foundations of creativity are believed to be spread across multiple brain regions. Critical areas involved in creative thinking include the prefrontal cortex, responsible for executive functions such as problem-solving and decision-making; the default mode network, active during daydreaming and imagination; and the salience network, which selects relevant stimuli from the environment for creative thought.
Prior research has shown that specific regions like Broca’s area and its counterpart in the right hemisphere of the brain are activated during music improvisation, differing from when a musician plays precomposed music.
Study author Atsumichi Tachibana and his colleagues wanted to explore whether there might be previously unidentified brain areas involved in the improvised playing of rock music. Their previous study found that brain activity in several areas of the brain differed when musicians played formulaic music and when they were improvising. This mainly involved Brodmann area 46 of the dorsolateral prefrontal cortex.
The study included 20 adult male participants, three of whom were professional musicians, ranging in age from 19 to 63 years. All participants were proficient guitar players. During the study, they performed both improvised and formulaic blues rock sequences.
During their performances, participants underwent functional near-infrared spectroscopy (fNIRS) imaging. This non-invasive technique measures brain activity by detecting changes in blood flow and oxygenation levels in the cortex using near-infrared light. A notable feature of fNIRS is that it only requires the participant to wear a flexible cap, unlike other neuroimaging techniques that involve large, confining scanning equipment. This makes fNIRS especially useful for studying brain activity during various human activities.
The results showed increased activity in Brodmann area 45 and its counterpart in the right hemisphere while participants played improvised music, but not during formulaic playing. Formulaic playing typically relies heavily on standard, predictable patterns and techniques, often repeating common chord progressions, riffs, and solos with little variation or improvisation, and involves far less creativity than improvising.
Brodmann area 45 is part of the frontal cortex in the human brain, situated in the inferior frontal gyrus. It is one of the components of Broca’s area, which is essential for speech production and language comprehension.
“Our results indicate that bilateral BA45 [Brodmann area 45] activity is common during creative processes that involve improvisation across all participants, regardless of subjective feelings, skill, age, difficulty, history, or amount of practice. We suggest that this is related to the sustained execution of improvisation In “motor control,” analogous to motor planning in speech control,” the study authors concluded.
The study sheds light on brain activity during creative processes. However, it should be noted that guitar improvisations are just one manifestation of creativity. It is possible that other types of creative processes involve different areas of the brain.
The paper, “Rock music improvisation shows increased activity in Broca’s area and its right hemisphere homologue related to spontaneous creativity,” was authored by Atsumichi Tachibana, J. Adam Noah, Yumie Ono, Shun Irie, Muneto Tatsumoto, Daisuke Taguchi, Nobuko Tokuda, and Shuichi Ueda.