"Road anger" such as driving anger, changing lanes, overtaking, etc. is a mental illness called intermittent, fulminant disorder (IED). Some studies have found that the positive rate of Toxoplasma gondii in IED patients is non-IED Researchers believe that Toxoplasma gondii infection may be the culprit for IEDs, including "road anger". Which of the following, if true, cannot support the researcher's point of view? ['Toxoplasma infected mice are often bolder, more adventurous, and therefore more likely to be caught by cats.', 'Toxoplasma over-stimulates neurons in the brain that control the threat response, easily triggering aggressive behavior.', 'Impulsive behavior decreases after anti-infective treatment for IED patients who test positive for Toxoplasma gondii.', 'Toxoplasma is a protozoan parasite on cats, but cats are more docile.']