The Cognitive Architecture of Zero

The concept of zero challenges human cognition because it requires treating the absence of quantity as a numerical value.

• Development: Children typically display operational knowledge (e.g., correctly "giving zero" items) before meta-knowledge (acknowledging zero as a number). This disconnect arises because preschoolers often conceptualize numbers as properties of objects; since an empty set contains no objects, they struggle to assign it a number property.

• Neuroscience: Contrary to the idea that zero is just a "null" category, single-neuron recordings in the human brain reveal that zero is integrated into the mental number line. Neurons exhibit a numerical distance effect, treating zero as a quantity situated just below one. The brain confuses zero more often with one than with larger numb ...