At a staff meeting, a conference, or a classroom, we scan the room and notice who is there. But researchers at New York University, Hebrew University of Jerusalem, and their collaborators have discovered something unsettling: most of us are far more likely to spot who is present than to notice who is missing entirely.
In a series of experiments conducted across the United States and Israel, psychology researchers found that people frequently failed to detect the complete absence of women, men, or racial minorities in everyday settings—from university campuses to kindergarten classrooms to academic conferences. The bias cut across demographics and political ideology alike. Even participants who belonged to the underrepresented group themselves failed to notice when their own demographic was entirely absent from a given context.
The research, led by Rasha Kardosh, a postdoctoral fellow at New York University, and co-led by Yaacov Trope at NYU and Ran Hassin at Hebrew University of Jerusalem, appears in the Proceedings of the National Academy of Sciences. In one striking text-based experiment, participants read articles featuring six expert neurosurgeons. When all six were men, most participants never noticed the absence of women. Yet when even a single woman appeared among the six, participants were far more likely to notice her presence.
A visual experiment yielded even more dramatic results. When participants viewed faces that broadly reflected the racial composition of the United States population, they were asked to identify when an entire racial group was absent. Participants proved 14 times more likely to notice when white faces disappeared than when Black faces were absent. In classroom experiments, participants similarly failed to detect the absence of male teachers—a minority in that profession—while readily spotting when female teachers were absent.
What explains this persistent blind spot? According to Hassin, the answer lies in how human attention fundamentally works. "People tend to notice what is in front of them, while absence requires more deliberate attention," he explains. "A person might attend a conference, read an article, or move through the workplace without realizing that an entire group is absent." Psychologists have long understood that the human mind is attuned to presence over absence, but the specific contexts and patterns governing this phenomenon have remained less clear—until now.
Remarkably, neither political ideology nor explicitly held social attitudes predicted who would notice these absences. Participants across the political spectrum showed the same pattern. Even Black and female participants, when minorities in a particular experimental context, missed the absence of their own demographic group. The bias operated independently of how people consciously thought about diversity or equality.
Kardosh emphasizes the real-world stakes. "These findings suggest that underrepresentation can be hard to see—regardless of who you are. People often notice who stands out, but not who is missing altogether, with these blind spots occurring in everyday settings." For fields like neurosurgery, where women remain underrepresented, or education, where men are scarce, this invisible barrier to noticing imbalance may explain why underrepresentation persists even when people genuinely value diversity. Until we deliberately train our attention to notice absence, not just presence, systemic imbalances may remain invisible in plain sight.