Ontogeny Chart

THE ONTOGENY OF HUMAN NEUROLOGICAL FUNCTIONS

S	BRAIN STAGE	AVERAGE TIME FRAME	VISION	AUDITORY	TACTILE			MOBILITY	LANGUAGE	MANUAL
12	CORTEX	6YEARS TO PEER LEVEL	All visual abilities equal to or above peers, consistent with dominant hemisphere	All auditory abilities equal to or above peers, consistent with dominant hemisphere	All tactile abilities equal to or above peers, consistent with dominant hemisphere	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	All mobility functions equal to or above peers, consistent with dominant hemisphere	All language abilities equal to or above peers	All manual and writing skills equal to or above peers, consistent with dominant hemisphere
11	CORTEX	5YEARS TO 6YEARS	Reading books	Sophisticated concept of time and space	Sophisticated stereognosis Sophisticated proprioception	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	Hop, skip, jump, and other sophisticated skills	S ophisticated ability to express abstract thought	Writing many words spontaneously
10	CORTEX	4YEARS TO 5YEARS	Reading initial books	Conception of sophisticated abstract language	Concepts of solidity	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	Run and walk in complete cross pattern	Ability to participate in organized conversation Proper articulation	Writing several words spontaneously
9	CORTEX	3YEARS TO 4YEARS	Reading sentences	Conception of grammatical and idiomatic language	Concepts of shape	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	Initial walking cross pattern	Structured sentences Advancing vocabulary	Reproducing symbols and words
8	CORTEX	2YEARS TO 3YEARS	Reading phrases Reading many words	Comprehension of worldly information leading to concept of time and space	Concepts of size	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	Initial running in cross pattern	Initial sentences Many phrases	Sophisticated bimanual skills
7	CORTEX	18MOS. TO 24MOS.	Reading several words Identifying complex symbols	Comprehension of basic directions	Concepts of texture	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	Walk and run with arms down without pattern	Initial phrases Many new words	Bilateral and simultaneous cortical opposition
6	CORTEX	12MOS TO 18MOS.	Complete convergence of vision Identifying simple abstracts	Understanding many words and phrases	Initial stereognosis	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	Walk with arms in primitive balance role Free standing Cruising	Several spontaneous, meaningful words, however pronounced	Primitive use of tools Initial bimanual function
5	CORTEX	9MOS. TO 12MOS.	Initial binocularity	Understanding several single words	Awareness of 3rd dimension	CONCEPTION	UNIQUELY HUMAN PHYSICAL AND INTELLECTUAL SKILLS	Functional creeping culmination in cross pattern Pull to stand with fixed support	Word like sounds	Bilateral cortical opposition Unilateral cortical opposition
4	MIDBRAIN	6MOS. TO 9MOS.	Appreciation of fine detail	Appreciation of environmental sounds	Proprioceptive ability as related to balance and space Gnostic sensation	APPRECIATION	MEANINGFUL	Initial creeping Assume and maintain quadruped position	Range of expressive and meaningful sounds	Mature bilateral prehensile grasp
3	MIDBRAIN	3MOS. TO 6MOS.	Seeing gross detail Unified ocular movement	Localization of sounds	Localization of sensation	APPRECIATION	MEANINGFUL	Functional crawling culminating in cross pattern	Experimental use of sounds	Initial prehensile grasp
2	PONS	BIRTH TO 3 MOS.	Biocular outline perception	Response to threatening sounds Initial perception of sounds	Awareness of temperature and discomfort Early proprioception Vital sensation	PERCEPTION	VITAL	Initial crawling	Vital sounds	Bilateral vital release
1	MEDULA AND SPINAL CORD	BIRTH	Pupillary reflex	Startle reflex	Babinski	RECEPTION	REFLEX	Complete movement of all extremities	Birth cry	Bilateral grasp reflex