Based on Papez's experiment with aggression in rats and other studies, it was initially believed that the circuit was involved with emotion.
The circuit connects the hypothalamus and the cortex and acts as the emotional system of the brain. "
The cingulate cortex projects to the hippocampus, and the hippocampus projects to the hypothalamus by way of the bundle of axons called the fornix.
Hypothalamic effects reach the cortex via a relay in the anterior thalamic nuclei."

However, there has not been additional proof of the circuit's role in emotion over the years.
Now, the Amygdala is thought to play a key role in emotion, a structure that was not a part of the Papez circuit until 1952 when MacLean included it in the modified version of the circuit, the limbic system.
Based on Papez's experiment with aggression in rats and other studies, it was initially believed that the circuit was involved with emotion. The circuit connects the hypothalamus and the cortex and acts as the emotional system of the brain. "The cingulate cortex projects to the hippocampus, and the hippocampus projects to the hypothalamus by way of the bundle of axons called the fornix. Hypothalamic effects reach the cortex via a relay in the anterior thalamic nuclei."
However, there has not been additional proof of the circuit's role in emotion over the years. Now, the Amygdala is thought to play a key role in emotion, a structure that was not a part of the Papez circuit until 1952 when MacLean included it in the modified version of the circuit, the limbic system.
Papez circuit