primitive reflex

primitive reflex

any of various simple, stereotypic, automatic neuromuscular responses characteristic of the mature fetus and newborn but typically inhibited during the first year of life; primitive reflexes are directed by brainstem centers and include the startle (Moro), rooting, and tonic neck reflexes; abnormal persistence can lead to clumsiness, incoordination, and perceptual difficulties.

primitive reflex

any reflex normal in an infant or fetus. Its presence in an adult usually indicates serious neurological disease, such as dementia. Some kinds of primitive reflexes are grasp reflex, Moro reflex, and sucking reflex.

prim·i·tive re·flex

(prim-i'tiv rē'fleks)
Any of a group of reflexes seen during gestation and infancy that typically become integrated by an early age (most by 6 months); also seen in adults who have sustained an injury or acquired a disease of the central nervous system.
References in periodicals archive ?
Well, you're not being a wuss, you're responding to a primitive reflex buried deep in your brain, Fainting, or "vasovagal syncope" happens when our blood pressure drops, for a variety of reasons.
It is a primitive reflex in which the adrenal hormones, cortisol and epinephrine, are secreted quickly.
Usefulness of primitive reflex in demented and non-demented cerebrovascular patients in daily clinical practice.
Primitive reflex and MRI findings, cerebral blood flow in normal elderly.
Elbow reflexion response as another primitive reflex.
Primitive reflex in healthy, adult volunteers and neurological patients: methodological issues.
Clinical significance of primitive reflex in Alzheimer disease.
Primitive reflex and dementia: results from the Canadian study of health and aging.
They explain this phenomenon to be due to a loss of cortical control which in turn causes expression of a primitive reflex, i.
n = 55) Disequilibrium mild 23 (42) 17 (31) moderate 8 (15) 3 (5) severe 1 (2) 0 (0) any 32 (58) 20 (36)(*) Gait ignition failure 9 (16) 2 (4) Wide-based gait 17 (31) 8 (15) Short-stepping gait 19 (35) 9 (16)(*) Gegenhalten 10 (18) 1 (2)(*) Primitive reflex (any) 7 (13) 1 (2) Webster score > 5 13 (24) 2 (4)(*) Median (range) apraxia score Lower limb 1 (0-3) 0 (0-1) Total 3 (0-8) 0 (0-5)(*) (*) p < 0.
The tonic neck reflex or fencing pose, another primitive reflex, is noted when the baby's head is rotated to one side and the arm and leg on the same side as the face extend out while those on the opposite side are flexed.