This talks about how we can try to make AI more “honest”. Honesty here can mean both less hallucination and also making it more robust against adversarial training, but the article focuses on the first aspect.
It talks about determining a baseline by asking a model to answer both truthfully and to lie about the same topic and then look at the neuron weights to see if you can find a vector that represents truth.
If you artificially modify the weights by adding or subtracting the honesty vector, you can make the model truthful or lie almost independent of the prompt.
The paper shows similar effects by identifying a vector for immorality, power-seeking, memorization of learnt training data, emotions, etc.