It is now clear that most animals, including humans, possess an ability to rapidly estimate
number. Some have questioned whether this ability arises from dedicated numerosity …

Although luminance is the main determinant of pupil size, the amplitude of the pupillary light
response is also modulated by stimulus appearance and attention. Here we ask whether …

Humans can estimate numerosity over a large range, but the precision with which they do so
varies considerably over that range. For very small sets, within the subitizing range of up to …

Humans possess the remarkable capacity to assess the numerosity of a set of items over a
wide range of conditions, from a handful of items to hundreds of them. Recent evidence is …

Humans can approximately enumerate a large number of objects at a single glance. While
several mechanisms have been proposed to account for this ability, the fundamental units …

Animals including humans are endowed with a remarkable capacity to estimate rapidly the
number of items in a scene. Some have questioned whether this ability reflects a genuine …

Humans can estimate and encode numerosity over a large range, from very few items to
several hundreds. Two distinct mechanisms have been proposed: subitizing, for numbers up …

Humans have the remarkable ability to rapidly estimate the number of objects in a visual
scene without relying on counting, something referred to as the number sense. It has been …

We recently showed that the gain of the pupillary light response depends on numerosity,
with weaker responses to fewer items. Here we show that this effect holds when the stimuli …

Ponzo is a familiar name in psychology because of the illusion that takes his name. He had
a long and productive career in Italy, and some of his work was translated for international …