Strategy, discipline, and a well-known MBA program aren’t the best predictors of leadership success. The thing that quietly caps how high a leader can climb is something almost no executive development program is measuring.
A senior executive at a CPG company sat across from me last fall and described, in careful detail, the actions of a director on his team who was gradually hollowing out the culture of an entire division. Quiet exits, never-ending complaints, and a steady pattern of late deliveries his peers had stopped flagging because nothing ever happened when they did.
My client had known about this problem for fourteen months, and nothing had been done. Fourteen months is a long time for a leader who, by every other measure, is excellent. McKinsey before he was an operator, graduate degree from a school you’ve heard of, his division revenue up quarter after quarter. And still, over a year of kicking the can on a conversation that, given the circumstances, he could have had in twenty minutes.
His team cohesion was suffering because of it.
When I asked him what kept stopping him, he said something honest. “Every time I rehearse it, I feel my blood pressure go through the roof, and my stomach turns. I was hoping he’d learn by looking at the results of his behavior.”
Those words are the most reliable predictor of a leadership ceiling I’ve encountered. Not the discomfort itself, everyone feels the discomfort. The predictor is what a leader does with it. Pushing the discomfort away and not dealing with it is the biggest predictor of leadership failure I know of.
The Construct No One Is Measuring
I call it activation tolerance. It’s the capacity to stay functional through the spike of a hard situation long enough to act effectively within it. Not to suppress the discomfort. Not to run away from it. Not to muscle your way through it. To stay with it, keep your prefrontal cortex (the brain’s CEO) online while your nervous system insists something is wrong, and make the decision the moment calls for.
Most leadership development treats the executive’s role as a thinking job. Strategy, judgment, synthesis. The hard skills, as they’re called. The implicit theory is that better thinking produces better leaders. So we layer on frameworks, models, and 360s. We send people to Wharton. We coach them on feedback techniques (mostly for others).
That sometimes works for leaders who have nothing in the way. For most, the pattern is familiar. Smart people with well-known frameworks who keep ending up in the same situations, watching themselves spin in circles like dogs chasing their own tail, wondering why learning hasn’t led to change.
The leader’s role is an activation-tolerance job dressed up as a thinking role. Every consequential leadership act, from a significant termination to a pricing call to a public relations stance, is preceded by an internal experience akin to the fight-or-flight response. The leaders who climb through that experience, past the point where their peers stall out, have built the capacity to acknowledge the pull without obeying it.
What the Brain Is Actually Doing
The neuroscience here is well-mapped, and it’s not flattering to the way we currently train executives.
When a leader faces a high-stakes situation involving conflict, exposure, or ambiguity, the amygdala fires before the prefrontal cortex has a chance to weigh in. That’s by design. The threat-detection system is older and faster than our more thoughtful, planning systems, and any state it reads as dangerous can feel existential. Bruce McEwen’s foundational work on chronic stress in Physiological Reviews (2007) showed that repeated activation of this system actually reshapes the brain over time. The amygdala hypertrophies (gets bigger and stronger). The prefrontal cortex and hippocampus atrophy (get weaker and lamer). The executive who chronically avoids becomes, neurologically, more reactive and less regulated. The ceiling here is structural.
Then there is the cost in the room. Amy Edmondson’s research on psychological safety, going back to her 1999 Administrative Science Quarterly paper, established that silence is never neutral. Teams led by leaders who avoid discomfort show poorer error reporting, poorer learning, and poorer performance. Robert Hogan’s three decades of derailment research point in the same direction. Executives get stuck on interpersonal patterns they cannot break, not on cognitive ones. The technical bench in most organizations is deep. The activation-tolerance bench is not.
Just think of the last time you heard someone own their feelings in a room versus the last time someone talked about domain knowledge. It’s likely not even close.
A widely cited Crucial Learning workplace survey found that one in three employees said a single avoided conversation in their organization had cost more than $25,000. Thirty-seven percent said they would rather quit than have it. That’s the leadership tax, and it compounds quietly. In disengaged talent. In delayed decisions. In standards that drift because no one was willing to hold them.
Keeping the wrong person on your team, not making the tough call when you need to, or not sitting down for a hard talk with a team member. I’ve seen these cost millions and accrue over decades.
Why Smart, High-Performing Leaders Pay the Tax
The standard explanation is that these leaders lack courage, or skill, or discipline. None of that is right. The executive I described earlier had all three, in volume. What he lacked was a learned capacity to stay present with the specific internal experience the conversation triggered. The near-panic anxiety, the nausea, the dread. The rehearsed argument that wouldn’t quiet, carrying a flicker of a much older feeling underneath it.
This guy learned conflict was dangerous before he was eight years old.
This is where SPARO, the behavioral model I use with leaders, becomes useful. It maps the chain every hooked behavior runs through: Stimulus, Perception, Activation, Response, Outcome. The difficult employee is the Stimulus. Perception interprets him through everything the leader has ever learned, usually outside of awareness. Activation is the physiological spike that follows, the blood pressure and the turning stomach. Response is the behavior that relieves the spike, which here was avoidance. Outcome is what the avoidance produced, fourteen months of a hollowing division, which becomes the next Stimulus and feeds the loop.
The hook lives between Perception and Activation. By the time a leader is consciously weighing whether to have the conversation, the deliberation is already downstream of an Activation spike that pointed toward escape. Real control lives in the capacity to stay in that Activation without flooding into the automatic Response. That capacity is activation tolerance.
How It Actually Gets Built
Michelle Craske’s 2014 work on inhibitory learning rewrote the science of how humans develop tolerance for what they avoid. The old model said exposure works by extinguishing fear. The new model says exposure works by violating expectations. Each time a leader stays in a difficult situation, and the catastrophe they brace for doesn’t happen, the brain stores a new prediction alongside the old one. It’s practice. Tolerance is built one expectancy violation at a time. There is no shortcut.
The transformation runs on a second framework I call EAT: Explore where the Activation was first learned, Accept it without the shame that keeps reinforcing it, and Transform the Response into a new one. The leader above didn’t need to be braver. He needed to see where conflict got tagged as dangerous, accept that the eight-year-old’s response made sense once, and practice a new one.
For executives, that’s uncomfortable. The capacity gets built in repetitions of doing the thing the body is asking you not to do, slowly enough to learn from each one, often enough to accumulate. No one gets better at golf by going to the driving range once a year and hitting one ball. The leaders I’ve worked with who have raised their ceiling picked one situation they had been avoiding, stayed in it, felt what they had been protecting themselves from, and grounded themselves in the knowledge that building this capacity would make them better leaders.
This is also why models of leadership that emphasize rigid stoicism tend to backfire. The leader who performs strength by suppressing feelings is practicing a sophisticated form of avoidance. The neuroscience eventually catches up, usually as burnout, irritability, or a quiet, decade-long loss of edge they cannot quite name.
The Practical Implication
Activation tolerance is the real bottleneck in many organizations, because without it leaders can’t truly implement any strategic plan. So the question for any executive team is not what new strategy to learn. The question becomes where each leader is skirting around an uncomfortable experience that the role is asking them to face. Which conversation. Which decision. Which resolution. Leadership development, properly understood, is the work of expanding what a leader can sit with and still choose well.
The executive I started with did eventually have the conversation. It took him another six weeks, and it lasted twenty-eight minutes. Afterward, he told me the room felt different, and that something in himself had shifted. His whole body relaxed. The director left the company within the quarter. The division steadied. Two of the senior people who had been on the way out stayed.
He hadn’t learned anything new about leadership in those six weeks. He had built a slightly greater capacity to feel something he had spent fourteen months trying not to feel.
That capacity is the thing.
Dr. Adi Jaffe is a behavioral scientist, executive coach, keynote speaker, and author of Unhooked.