The researchers obtained electroencephalography recordings from participants during two separate nights in a sleep laboratory. After five-minute bouts of rapid eye movement (REM) sleep, participants were woken and asked to describe their dreams and rate the emotions they experienced in the dreams.
"We found that individuals who displayed greater alpha-band brain activity in the right frontal cortex as compared to the left during evening wakefulness and during REM sleep experienced more anger in dreams. This neural signature is known as frontal alpha asymmetry (FAA)," explains Pilleriin Sikka, lead author of the study published in the Journal of the Journal of Neuroscience.
Alpha-band brain activity refers to brain waves with a frequency of 8-12 Hz, and they are especially prevalent during relaxed wakefulness. Alpha waves are thought to reflect the inhibition of underlying brain areas. More alpha waves in the right frontal area thus indicate lower activity in that brain region.
"Previous studies have shown that frontal alpha asymmetry is related to anger and self-regulation during wakefulness. Our research results show that this asymmetrical brain activity is also related to anger experienced in dreams. Frontal alpha asymmetry may thus reflect our ability to regulate anger not only in the waking state but also in the dreaming state," Sikka added.
According to the researchers, the findings could potentially help to understand the neural basis of the emotional content of nightmares, a feature of various mental and sleep disorders. It also opens up new questions as to whether it would be possible to modulate emotional experiences in dreams by stimulating the frontal brain areas using brain stimulation techniques.
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