A novel research paradigm in cognitive neuroscience is the use of movies as stimulus material to investigate the neural mechanisms of cognitive and mental activities in subjects during watching movies. Previous studies have suggested that there are sex-related differences in the relationship between the visual and auditory design of movies and the cognitive and mental activities of viewers. Sex differences determine aesthetic differences, and aesthetic differences have different effects on different links in the whole process of film communication. Although it is well documented that there are obvious differences in the cognitive and mental activities between males and females when watching the same movie, the underlying neural mechanisms remain largely unknown. It is important to investigate the sex-related differences in functional brain activity during movie watching.
With the development of functional brain imaging technology, brain age prediction is considered to be an important indicator of an individual's level of brain aging. In addition, a large number of studies have shown that the gap between predicted and actual age is closely related to the deterioration of human brain function. Predicted brain age has been shown to be greater than actual age in patients with Alzheimer's disease, patients with traumatic brain injury, and patients with psychiatric disorders, such as schizophrenia and major depressive disorder. Comparing the similarities and differences in brain age prediction between males and females is expected to reveal different brain ageing trajectories. In particular, comparing male and female brain age prediction models based on movie viewing would be expected to reveal similarities and differences in the patterns of brain functional networks reflected by males and females in response to audio-visual stimuli from films.
Accordingly, this study used functional magnetic resonance imaging (fMRI) data from 528 subjects (261 males, aged 18~87 years) to investigate sex differences in the functional brain network while watching the classic psychological suspense short film 'Bang! You're Dead', directed by Alfred Hitchcock. Using these data, we obtained functional brain connectivity information during movie viewing, performed individualized brain age prediction for males and females separately, and explored the similarities and differences in brain connectivity between males and females during movie viewing. Specifically, a whole-brain functional connectivity matrix was constructed based on the functional activity of the subjects while watching the film. A machine learning technique was then used to predict the brain age of male and female viewers, and the differences in the functional connectivity driving the predictions were analyzed. We examined the similarities and differences in the overall process of brain aging between males and females through the correlation coefficients between the predicted age and the true age, and examined the similarities and differences in the functional brain networks driving the prediction of brain age between males and females.
Our results show that brain connectivity during film viewing can predict the brain age of both men and women with high accuracy. Specifically, the model prediction accuracy for brain age based on male functional brain imaging data was = .821 (± .007, .866), MAE = 8.240 (±.123) years, whereas the model prediction accuracy for brain age prediction for female data was = .848 (± .004), MAE = 7.978 (±.101) years. When analyzing the connections that drive the predictions, there are clear sex differences in the connections associated with the default mode network, reflecting differences in the integration of endogenous and exogenous information between the males and the females. Specifically, the contribution of functional connectivity in prediction models based on male data only explains 2.7% of functional connectivity contributing in prediction models based on female data. Overall, the study demonstrates significant differences in functional brain connectivity between male and female viewers during film viewing, providing neuroscientific evidence for the study of the diverse cognitive psychological activities of film viewers.
Key words
brain age /
sex-related difference /
movie viewer /
alfred hitchcock /
movie neuroscience
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