Sparse Population Coding of Faces in the Inferotemporal Cortex

• Published in: Science (American Association for the Advancement of Science) Vol. 256; no. 5061; pp. 1327 - 1331
• Main Authors: Young, Malcolm P., Yamane, Shigeru
• Format: Journal Article
• Language: English
• Published: Washington, DC American Society for the Advancement of Science 29.05.1992; American Association for the Advancement of Science
• Subjects: Animals; Behavioral neuroscience; Biological and medical sciences; Cell lines; Cerebral cortex; Discrimination (Psychology); Eye and associated structures. Visual pathways and centers. Vision; Face; Fundamental and applied biological sciences. Psychology; Hair; Humans; Macaca - physiology; Mathematical vectors; Mental stimulation; Neurons; Neurons - physiology; Physiological aspects; Population distributions; Sine function; Statistical variance; Temporal Lobe - physiology; Vertebrates: nervous system and sense organs; Visual discrimination; Inferotemporal cortex; Stimulus; Monkey; Central nervous system; Electrophysiology; Macaca fuscata; Vertebrata; Unit response; Mammalia; Primates; Simioidea; Face; Brain (vertebrata)
• ISSN: 0036-8075; 1095-9203
• DOI: 10.1126/science.1598577

How does the brain represent objects in the world? A proportion of cells in the temporal cortex of monkeys responds specifically to objects, such as faces, but the type of coding used by these cells is not known. Population analysis of two sets of such cells showed that information is carried at the level of the population and that this information relates, in the anterior inferotemporal cortex, to the physical properties of face stimuli and, in the superior temporal polysensory area, to other aspects of the faces, such as their familiarity. There was often sufficient information in small populations of neurons to identify particular faces. These results suggest that representations of complex stimuli in the higher visual areas may take the form of a sparse population code.