Here are some of the listed, known symptoms associated with Traumatic Brain Injury (TBI). I have deleted my previous post here on the subject to re-write this new one, with a more specific, detailed and extensive thread.

There are Two specific functions that I want to pay attention too in this first Paragraph due to their relevance to known data and facts regarding ‘Zodiac’.

The first of these Functions assigned to the frontal lobes is the regulation and control of our speech ability. Damage to the frontal lobes see the speech in a TBI patient effected and/or disrupted. " Repetition is intact, but they show difficulty in propositionizing, and active speech is severely disturbed. Luria suggested that this was due to a disturbance in the predictive function of speech, that which takes part in structuring sentences. The syndrome is similar to that form of aphasia referred to as transcortical motor aphasia. Benson (10) also discusses the "verbal dysdecorum" of some frontal lobe patients. "
We know Zodiac’s speech was described as Monotone sounding (Slover) and as "Very slow and measured, real distinctive Cadence to the voice, a balanced flow to the way he spoke words and sentences." (Hartnell). Now the therapy/treatment for brain injured speech disturbance is what is known as ‘rhythmic control treatment’ This involves the specialist working with the speaker to get the speaker to slow his or her rate of speech down to a certain number of syllables to a rate or rhythmic beat. Foe example, tapping the patients knee every 3 seconds as a cue for them to speak in conjunction with each tap or beat. This is said by the speech therapists themselves to leave the speaker sounding as if he or she is ‘robotic’, sounding as if speaking in a monotone, but it’s a necessary part of of the treatment and shown to have high success rates.

Second Function I want to draw attention to is Motor Function Ability, and how damage to the lobes will often leaves the side effects and symptoms described in the next few sentences. Motor Function is the ability of the body’s limbs to carry out and perform functions based on messages from the Brain. Damage to the frontal lobes often leaves a patient with a lack of control over the body’s coordination. " Lesions of the lateral frontal cortex, most closely linked to the motor structures of the brain, which lead to disturbances of movement and action with perseveration and inertia, and lesions of the orbital and medial areas. The latter are interlinked with limbic and reticular systems, damage to which leads to disinhibition and changes of affect. A third syndrome, the medial frontal syndrome, is also noted, marked by akinesia, associated with mutism, gait disturbances, and incontinence."
What significance does this have here? Well, a lot IMO. Donald Fouke, Trained SFPD Police Officer recalls the man he saw making his way down the Jackson St hill shortly after the murder of Paul Stine, appeared to be walking very oddly, in his words "This lumbering gait… Stumbling along with a sort of semi limp" motion. Again, exactly what you would expect if the man you were observing were a victim of TBI, specifically, Frontal Lobe Damage.

So, in this first section, we already have Zodiac walking and talking with consistent and corroborating symptoms with that of someone who has suffered Frontal Lobe Damage. That is only the start of what fits the known facts and witness testimony given about Zodiac that is highly consistent with symptoms of TBI. Here are some of the other astonishingly accurate consistencies between Known Zodiac behaviour and the symptoms exhibited in TBI patients….

1. Inability to interpret external input and adjust behaviour accordingly; excessive risk taking and inability to comply or conform to established rules.
2. Difficulty communicating in regards to speaking too much or not enough and inaudible or incoherent speech patterns.
3. Lack of information processing such as not having the ability to understand when a person is being dishonest or deceitful; unable to understand the experiences, emotions and feelings of another person .
4. Lack of attention and memory consisting of limited amount of short term memory and altered or distorted long term memory.
5. In most cases a frontal lobe injury will have no negative results on IQ scores.

"The clinical manifestations associated with damage to the front-temporal connections are often a mixture of behavioural, cognitive and affective symptoms that include personality disintegration, coping disturbances and impulsive control of behaviour. Attention impairment and executive function deficits are also frequently
observed. Disinhibited behaviour is the distinctive feature of the ‘pseudo-psychopathic syndrome’, which is often observed in patients with orbitofrontal damage. In these patients disinhibited behaviour is accompanied by irritability, egocentrism, childishness, stubbornness aswell as tactless, aggressive and abusive behaviour. If ever there were five words strung together to describe Zodiac, the Five listed there would be absolutely accurate in that they fit Zodiac’s known personality seen in his letters like the proverbial Glove. The above paragraph is taken direcdtly from an article written by:

Giuseppe Zappala – Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Kings College, London, UK.

Michel Thiebaut de Schotten b,c – Also of The Department of Forensic and Neurodevelopmental Sciences, Institute of Psychiatry, Kings College, London, UK

and Paul J. Eslinger d,e – Department of Neurology (Center for MRI Research), Penn State Hershey Medical Center, Hershey, PA, USA & Department of Radiology (Center for MRI Research), Penn State.

"Since frontal lobe damage causes marked deficits in mood, personality and behavior, a patient might have to thoroughly overhaul many of his or her most basic coping and human relations strategies. By no means will this process be easy. However, with the care and expertise of all members of the team, the patient can often improve far above and beyond his or her expectations"