## 2 Materials and Methods
### The TASHUN Reflex Assessment Protocol  
The TASHUN test battery measures three primitive reflexes: TLR, ATNR and STNR. The aim of the assessment: Determining the level of retained symptoms of primitive reflexes in the tested person and the activity level of these primitive reflexes. Head movements trigger these reflexes. In case the reflexes are already inhibited, the subject can move the head without the movement of any other body parts. This means that the subject is able to move body parts independently from the head--or in this case, to keep them still.  
Methodological recommendations: For researchers, it is recommended to make a video recording of the reflex assessment, as such records allow for more objective and repeated analyses improving the reliability of scoring. For practicing professionals, such as trainers, physical education teachers and primary school teachers, it is sufficient to mark the affected body parts on the \"TASHUN data registration sheet\" (Table A1), as the main goal in their case is rapid feedback and practical usability.  
We recommend performing the assessments in a gym or an exercise room, under quiet conditions. Children are asked to wear sportswear, like short-sleeved T-shirts tucked into the trousers. The tasks should be performed barefoot, the hair tied up. After describing the task, all subjects should try to execute it. Any errors resulting from a lack of understanding or attention should be corrected, as necessary. After this, the evaluation protocol is performed. The complete assessment takes about 6 min for each child.  
Testing the Tonic labyrinthine reflex /TASHUN TLR/  
Test position: The tested person stands barefoot, with feet together, eyes closed, and keeping the arms relaxed next to the torso.  
Description of the test: Ask the tested person to bend the head back as much as they can in a count of 4 (time per beat) and hold it there for a count of 4 (time per beat). Then, ask them to bend the head forward as much as they can in a count of 4 (time per beat) and hold it there for a count of 4 (time per beat). A metronome can be helpful in setting the appropriate pace for the movement and the holding time. Time per beat: 65. Number of repeats: 5.  
Correct execution: Only the head moves forward or backward.  
Testing the Symmetrical tonic neck reflex /TASHUN STNR/  
Test position: The tested person is kneeling on hands and knees, not wearing any shoes. Knees are together, the head is in line with the torso. Hands are placed in the line of the shoulder, fingers facing forward, extended. Eyes are closed.  
Description of the test: Ask the tested person to bend the head forward in a count of 4 (time per beat) such that the chin touches the chest, if possible, and hold it there for a count of 4 (time per beat). Then, ask them to lift the head in a count of 4 (time per beat) and bend it backwards as much as they can, holding it there for a count of 4 (time per beat). A metronome helps in setting the appropriate pace for the movement and the holding time. Time per beat: 65. Number of repeats: 5.  
Correct execution: Only the head moves forward or backward.  
Testing the Asymmetrical tonic neck reflex /TASHUN ATNR/  
Test position: The tested person is kneeling on hands and knees, not wearing any shoes. Knees are together. The head is in line with the torso. Hands are placed in the line of the shoulder, fingers facing forward, extended, eyes are closed.  
Test: Ask the child to turn the head to one side in a count of 4 (time per beat) so that the chin reaches the line of the shoulder, then hold it there for a count of 4 (time per beat). After that, ask them to turn the head to the other side in a count of 4 (time per beat) so the chin reaches the line of the shoulder and hold it in that position for a count of 4 (time per beat). A metronome helps in setting the appropriate pace of the movement and the holding time. Time per beat: 65. Number of repeats: 5.  
Correct execution: Only the head moves right side or left side.