AI hallucinations occur in various forms and can be visual, auditory or other sensory experiences and be caused by a variety of factors like errors in the data used to train the system or wrong classification and labelling of the data, errors in its programming, inadequate training or the systems inability to correctly interpret the information it is receiving or the output it is being asked to give. However, unlike in humans, AI hallucinations are not caused by brain disorders or mental illnesses but are because of errors or biases in the data or algorithms used to train the AI system. An AI system writing a perfectly coherent article on something that does not even exist can also be considered an example of AI hallucination.