Co-authored with Sarah Bergenfield
Internal family systems (IFS) therapy generally begins with a straightforward yet profound request: Turn your attention inside and notice what is there. Whatever surfaces, practitioners call a part. It might be an internal voice communicating a message, an image being projected across the mind’s eye, two distinct voices in an internal debate, or simply a physical sensation registering in the body. Once you notice it, you are already differentiating: You realize that it is not you, and you are not it. If you find yourself immediately wishing it away, suppressing it, or tuning it out because you fear or hate it, therapists recognize that reaction as yet another part. You can then ask that resistant part to differentiate, or unblend, as well.
In the lexicon of IFS, qualities such as curiosity, clarity, confidence, compassion, and other centered feeling states that naturally emerge when parts differentiate are known collectively as self or self-energy. Sometimes, the moment one part unblends, another one blends in to take its place. When this happens, the process simply repeats: patients are encouraged to keep asking the internal elements to separate until they feel a genuine sense of curiosity.
As a psychotherapy approach, IFS has historically been far more concerned with direct engagement than with abstract explanation. Its primary aim is for participants to actively interact with—and fully occupy—their inner experiences, rather than relying on distraction or dissociation. Yet, this experiential focus is not entirely satisfactory for everyone. Some individuals find the iterative process of helping multiple parts unblend to be frustrating and deeply confusing, while others feel genuinely alarmed when their internal parts seem to talk back. Once a person’s focus shifts from experiential engagement to simply trying to understand what is being asked of them, the standard, routine IFS question—“How do you feel toward this part?”—can inadvertently amplify their frustration, leading to internal dead ends of "How am I supposed to do this?" and "What is a part anyway?"
The Role of Storytelling and Curiosity in IFS
While traditional IFS does not rely on a heavily research-based neuroscientific answer for every operational mechanism, the human mind naturally formulates hypotheses and tells stories to make sense of reality. If a person gets an emotional thrill from connecting with their internal parts and manages to construct a satisfactory narrative about the experience, they will neither want nor need alternative explanations. However, for those who find themselves confused or simply intellectually curious, considerable value can be found in pondering a neuroscience-informed story about how these parts operate.
To understand this intersection, experts look first to the fundamental architecture of the brain. To successfully navigate a relentless tsunami of environmental data while conserving metabolic energy, the brain constructs a comprehensive world model during childhood and subsequently predicts that this established model will perpetually repeat. These predictions are actively represented in the mind—which neuroscientists broadly view as an emergent product of the brain—visually, aurally, or through somatic sensations. Whichever way they appear, when individuals pay close attention and interrogate these internal states, they frequently receive revealing answers: I conform now because I had to as a child, or If I stop doing this, I will be punished, and so on. In this way, people routinely hear internal stories about past dangerous times that serve to reinforce old predictions and heavily influence current behavior.
The primary evolutionary job of the brain is survival. Consequently, conservative behavioral patterns that may no longer keep us safe can continue to operate long after our external circumstances have radically changed. When the brain becomes stuck in these loops, it needs to be influenced and updated. The mind intuitively shows us how this can be done through the power of stories. When individuals learn to think of patterned behaviors as distinct entities, or parts, which are subjectively represented by distinct feelings, opinions, and goals, they successfully engage their innate relational skills. They begin to offer genuine empathy and compassion—not just to others, but to themselves. They learn to feel into the profound strangeness of subjective experience, where a person can feel older and younger, wiser and more innocent or ignorant all at the same time, and they learn to accept all of those dimensions.
Understanding the Inner Community of Parts in IFS
Internal Family Systems describes this dynamic, multi-age self-experience as an inner community of parts. Within this internal community, vulnerable parts are routinely looked after and protected by other parts. These protectors, whose primary evolutionary task is to remain conservative, tend to keep seeing what they have learned to expect, regardless of what neuroscientists call prediction errors—information that directly contradicts expectations and can, or should, be used to update an outdated predictive model. By combining the vernacular of IFS with modern neuroscience, researchers suggest that protective parts essentially function as alarm predictions that activate in familiar contexts. However, unlike standard predictions that do not involve immediate threat, these protective alarms fail to update in response to ongoing prediction errors.
Through the lens of neuroscience, the parts that suffer and enact these complex dynamics can be understood as pattern-based predictions. These are deeply learned expectations about what is likely to happen next, paired with a familiar, well-worn way of feeling and acting in order to meet those expectations.
Consider a common trajectory: A harmful event occurs, and the brain instinctively predicts more of the same, which quickly launches two distinct narratives that continue to run in tandem. The first is a negative identity story—conclusions such as I am unlovable or I will always be hurt and exploited. The second is a survival story, featuring whirlwind efforts like dissociation, denial, self-attack, self-sacrifice, deflected rage, or addiction designed to quickly and effectively manage the perceived threat. Over time, these protective strategies may wreak profound relational and identity havoc, but they are undeniably effective in the short run. Crucially, they are not the linchpin problem; they are simply attempted solutions to a deeper wound.
Revising Negative Identity and Survival Stories
In a therapeutic setting, the ultimate goal is for the core problem—that foundational assault on personal value that calcified into a negative identity, representing a "terrible truth" experience—to safely emerge and be revised. Accordingly, IFS therapy characteristically begins with the strategic aftermath of an identity insult, referred to here as the survival story, and gradually works its way back to the precipitating events to facilitate a psychological do-over. This is not about rewriting historical reality, but rather about the active reclaiming of personal credibility, worth, and inherent goodness.
To successfully free the brain from fear-based rigidity, therapy actively engages the mind and its internal stories. Through this process, the primal human exploration of value and lovability—captured in the question Who am I?, which was abruptly interrupted when the traumatic event occurred—can finally continue to move in a positive, generative direction. Translated into the language of neuroscience, therapy aims to establish a sufficiently safe context in which the brain can finally update the expectations that were long ago paired with negative, pattern-based predictions.
References
- Schwartz, R.C. & Sweezy, M. (2019). Internal Family Systems Therapy (2nd ed.). Guilford Press.
- Parr, T., Pezzulo, G., & Friston, K. J. (2022). Active inference: The free energy principle in mind, brain, and behavior. MIT Press.