Researchers uncover a surprising bias in non-conscious processing: negative spoken words are less likely to reach conscious awareness than neutral ones.

Conventional wisdom holds that once we become aware of negative or threatening information, it grabs our attention. But a new study suggests the opposite may happen before information even reaches awareness.

The research was conducted by Gal R. Chen, Zaheera Maswadeh, Prof. Leon Deouell, and Prof. Ran R. Hassin at the Hebrew University of Jerusalem. Their findings, published in Psychological Science, reveal that people are significantly less likely to consciously detect negative spoken words than neutral ones when their attention is occupied by another task.

Across three experiments involving more than 100 participants, researchers played fully audible Hebrew words in the background while volunteers performed demanding visual tasks. Some words carried negative emotional meaning, such as references to danger, sadness, or violence; others were emotionally neutral. Participants were then asked whether they had heard a meaningful word.

The result was striking: neutral words consistently reached conscious awareness more often than negative words.

The findings challenge longstanding assumptions about how emotional information gains access to conscious awareness and open a new window into the hidden mental processes that determine what we notice and what we miss – processes that carry a large influence into what we think, feel, and decide.

“Most theories predict that emotionally negative information should receive priority because it may signal threats,” said lead author Gal R. Chen of the Hebrew University's Department of Psychology. “Instead, we found that the mind may sometimes filter out emotionally costly information before we become aware of it. Think about a bus driver who needs to ignore a passenger who angrily speaks in their phone – not hearing the negative information, and stopping to procees it, may be beneficial”.

The effect remained robust across multiple experiments, objective and subjective measures of awareness, different task difficulties, and extensive controls for acoustic, phonetic, and linguistic factors.

Beyond emotion, the study also addresses a fundamental question in cognitive science: how the brain selects which information becomes part of conscious experience. While previous research has focused largely on vision, the new work examines audition—a sensory system that is always on and cannot be voluntarily shut off.

Because the emotional meaning of a word influenced whether it reached awareness, the results suggest that the brain evaluates semantic and affective information before conscious perception occurs. The findings point to a previously underappreciated role for nonconscious processes in determining what enters awareness and what remains outside it.