Biomaterial Database

Convergence of finger tremor and EEG rhythm at the alpha frequency induced by rhythmical photic stimulation. 1983

M Isokawa, and B R Komisaruk

The frequencies of EEG alpha rhythm and physiological finger tremor overlap at 9-10 c/sec, suggesting a functional relationship between the two mechanisms. We measured the correlation between the two rhythms when they occurred spontaneously and when rhythmical photic stimulation was applied. Rhythmical physiological finger tremor (9.7 c/sec +/- 1.06 S.D.) was accompanied by an alpha rhythm (10.3 c/sec +/- 0.51 S.D.) spontaneously, showing a one-to-one relationship at times. When photic stimulation was provided at a frequency (11 Hz) close to the subject's spontaneous alpha rhythm, a frequency-convergence occurred between finger tremor (10.3 c/sec +/- 0.68 S.D.) and the EEG (10.6 c/sec +/- 0.35 S.D.). The correlation coefficient between the two rhythms under photic stimulation was significantly higher (0.49 +/- 0.14 S.D.) than under the spontaneous condition (0.13 +/- 0.16; P less than 0.05). Consistent with this, the mean difference between finger tremor and EEG frequencies was significantly lower during photic stimulation (0.83 c/sec +/- 0.46 S.D.) than during the spontaneous condition (1.23 c/sec +/- 0.82 S.D.) (t = 2.54; P less than 0.05, t-test for correlated means). These findings indicate that the EEG and physiological finger tremor tend toward synchrony with each other in an environment of photic stimulation, supporting our hypothesis of a functional relationship between the two mechanisms.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D010775	Photic Stimulation	Investigative technique commonly used during ELECTROENCEPHALOGRAPHY in which a series of bright light flashes or visual patterns are used to elicit brain activity.	Stimulation, Photic,Visual Stimulation,Photic Stimulations,Stimulation, Visual,Stimulations, Photic,Stimulations, Visual,Visual Stimulations
D001921	Brain	The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.	Encephalon
D004569	Electroencephalography	Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.	EEG,Electroencephalogram,Electroencephalograms
D005260	Female		Females
D005385	Fingers	Four or five slender jointed digits in humans and primates, attached to each HAND.	Finger
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000328	Adult	A person having attained full growth or maturity. Adults are of 19 through 44 years of age. For a person between 19 and 24 years of age, YOUNG ADULT is available.	Adults
D014202	Tremor	Cyclical movement of a body part that can represent either a physiologic process or a manifestation of disease. Intention or action tremor, a common manifestation of CEREBELLAR DISEASES, is aggravated by movement. In contrast, resting tremor is maximal when there is no attempt at voluntary movement, and occurs as a relatively frequent manifestation of PARKINSON DISEASE.	Action Tremor,Intention Tremor,Resting Tremor,Coarse Tremor,Continuous Tremor,Darkness Tremor,Fine Tremor,Intermittent Tremor,Involuntary Quiver,Massive Tremor,Passive Tremor,Persistent Tremor,Pill Rolling Tremor,Rest Tremor,Saturnine Tremor,Senile Tremor,Static Tremor,Tremor, Limb,Tremor, Muscle,Tremor, Neonatal,Tremor, Nerve,Tremor, Perioral,Tremor, Semirhythmic,Action Tremors,Coarse Tremors,Continuous Tremors,Darkness Tremors,Fine Tremors,Intention Tremors,Intermittent Tremors,Involuntary Quivers,Limb Tremor,Limb Tremors,Massive Tremors,Muscle Tremor,Muscle Tremors,Neonatal Tremor,Neonatal Tremors,Nerve Tremor,Nerve Tremors,Passive Tremors,Perioral Tremor,Perioral Tremors,Persistent Tremors,Pill Rolling Tremors,Quiver, Involuntary,Rest Tremors,Resting Tremors,Saturnine Tremors,Semirhythmic Tremor,Semirhythmic Tremors,Senile Tremors,Static Tremors,Tremor, Action,Tremor, Coarse,Tremor, Continuous,Tremor, Darkness,Tremor, Fine,Tremor, Intention,Tremor, Intermittent,Tremor, Massive,Tremor, Passive,Tremor, Persistent,Tremor, Pill Rolling,Tremor, Rest,Tremor, Resting,Tremor, Saturnine,Tremor, Senile,Tremor, Static,Tremors