Abstract
An elevated expression of c‐fos nuclear protooncogene (immediate early gene) has been shown repeatedly to correlate with long‐term neuronal responses. This paper reviews recent data suggesting that neuronal plasticity, including learning and memory formation, may involve c‐fos expression as well. On the basis of biological functions of the Fos protein, well known to be a component of a transcription factor, AP‐1, (activator protein 1) a hypothesis suggesting a role of transcription factors in the integration of information during learning processes is proposed.