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Igor Branchi is Research Director and Group leader at the Center for Behavioral Sciences and Mental Health, Istituto Superiore di Sanità/Italian Institute of Health, Rome, Italy. His research focuses on the interplay between biological and environmental factors in the onset and treatment of psychiatric disorders, exploiting a complexity approach to mental health. He is also interested in philosophical dimensions of scientific inquiries aimed at understanding the interplay between brain functioning and the mind. Current efforts are directed towards the study of the interplay between plasticity and contextual factors, such as stressful or supportive living conditions, in defining mental health outcomes. Additionally, his research leverages a network-based approach to operationalize plasticity, enabling the assessment of an individual susceptibility to changes in mental state, and the prediction of transitions from psychopathology to wellbeing. He has been visiting Professor of Behavioral biology at the University of Rome Sapienza from 2018 to 2023, and President of the European Brain and Behaviour Society.
Among Igor's main research activities and contributions:
The double-edged sword of neural plasticity
High plasticity level induced by drugs, such as serotoninergic antidepressants and psychedelics, is not beneficial per se. It renders the brain and behavior more susceptible to change according to contextual factors, such as the living conditions. Therefore, high plasticity is therapeutic when combined with favorable context achieved through psychotherapy or environmental interventions.
A computational, network-based approach to quantify plasticity: predicting transitions from psychopathology to wellbeing
I have proposed a network-based, computational approach to quantify plasticity prospectively from network topology. Plasticity is defined as the susceptibility of a system to change, allowing us to identify, at baseline, which individuals are more likely to modify their behavioral outcomes and mental state in response to therapies or contextual factors. By linking optimal plasticity to criticality, this approach provides a mathematical framework to predict when a system is most ready to transition. We have demonstrated that this framework can predict which depressed patients are likely to improve, anticipating both the magnitude and the timing of the transition from psychopathology to wellbeing
Permissive and instructive causality: integrating biological and environmental factors in neuroscience and mental health
In the framework of the Context Theory of Constrained Systems, when considering an individual as a complex system, causal processes within the individual are exclusively permissive, whereas causal processes outside the individual can be either permissive or instructive, in relation to the individual’s global emergent outcomes. Accordingly, when dealing with mental states or complex behaviors, biological substrates -- from genes to brain areas -- operate through permissive causality, shaping a space of possibilities rather than instructing a specific outcome. By contrast, contextual factors -- such as life challenges or subjective appraisal -- can operate also through instructive causality, steering behavior and mental states toward specific trajectories. Therapeutic strategies should harness the synergistic interplay between these types of causality, targeting biological substrates to enable transitions in mental states, and leveraging contextual factors to steer these transitions toward mental wellbeing.
The interface principle: behavior and mental states as a privileged level of control of brain functioning
Behavior and the associated mental states are the interface between the central nervous system and the living environment. Since, in any system, the interface is a key regulator of system organization, behavior is proposed as a unique and privileged level of control and orchestration of brain structure and activity. This view has relevant scientific and clinical implications. First, the study of behavior represents a singular starting point for the investigation of neural activity. Second, behavioral changes, accomplished through psychotherapy or environmental interventions, are expected to have the highest impact to reorganize the human mind and achieve a solid and long-lasting improvement in mental health.
Breaking free from the inflammatory trap of depression: regulating the interplay between immune activation and plasticity to foster mental health
Any deviation toward an extreme immune activation or suppression leads to a dysregulation in the molecular machinery underlying neural plasticity. Therefore, pro–inflammatory conditions in depressed patients are associated with impaired plasticity, limiting the potential to recover. However, reinstating plasticity does not lead to an improvement per se but increases the likelihood of recovery. Therefore, combining the normalization of immune activity with environmental conditions promoting wellbeing is critical to achieve a beneficial outcome.
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