• Closing your eyes is a natural reflex your body has each time you sneeze . (girlwithanswers.com)
  • This phenomenon is known as photic sneeze reflex or solar sneeze reflex . (girlwithanswers.com)
  • Known as photic sneezing or - more appropriately - ACHOO (autosomal dominant compulsive helio-ophthalmic outbursts), this hereditary sneeze-starting trait is found in roughly a third of the population. (greatist.com)
  • It's unknown what causes this to happen (other than the universe wanting us to have nice, chocolatey things), which technically makes it a photic sneeze reflex. (greatist.com)
  • If you sneeze when suddenly exposed to sunlight or other bright lights, you're not alone: research estimates that up to 30% of all humans share this peculiar trait, known as the "photic sneeze reflex. (drmayankshukla.com)
  • Usually, this reflex is triggered when nerves detect an irritant in the mucus lining, notifying the brain to activate a sneeze in order to expel the intruders. (drmayankshukla.com)
  • Some scientists speculate that photic sneezing may be caused when the optic nerve gets crossed with the trigeminal (fifth cranial) nerve, resulting in a sneeze in response to light stimulation. (drmayankshukla.com)
  • In 2010, researchers from the genetic testing company 23andMe identified two distinct nucleotide polymorphisms (SNPs) linked to the photic sneeze reflex, one of which is located close to the gene associated with light-induced epileptic seizures. (drmayankshukla.com)
  • Doctors are hoping that as more knowledge on the photic sneeze reflex is discovered, it can also be applied to the study and treatment of epileptic seizures. (drmayankshukla.com)
  • Drivers with the photic sneeze reflex have reported concern when driving through tunnels, as the sudden exposure to sunlight upon leaving activates a set of 2-3 consecutive sneezes, temporarily impairing their ability to drive. (drmayankshukla.com)
  • Reflex epilepsy is a condition in which seizures can be provoked habitually by an external stimulus or, less commonly, internal mental processes. (medscape.com)
  • Reflex epilepsy can only be diagnosed in people whose seizures occur only in the presence of particular triggers. (medscape.com)
  • Photosensitive epilepsy is the most common type of reflex epilepsy. (medscape.com)
  • [ 4 ] Some authors have described cases of myoclonic seizures as a reflex response to sudden unexpected tactile or acoustic stimuli and this clinical entity has been proposed as a separate nosographic syndrome, referred to as reflex myoclonic epilepsy in infancy (RMEI). (medscape.com)
  • Reflex reading epilepsy: effect of linguistic characteristics on spike frequency. (ulaval.ca)
  • Reading epilepsy is a rare reflex epilepsy in which seizures are provoked by reading. (ulaval.ca)
  • alternatively, reflex seizures may coexist with spontaneously occurring seizures. (medscape.com)
  • Reflex seizures may clinically manifest as partial or generalized seizures. (medscape.com)
  • Interictal epileptic discharges (IEDs) can be provoked by particular stimuli in people with recurrent unprovoked seizures or reflex seizures, but if occurring spontaneously, they reflect susceptibility for unprovoked seizures. (medscape.com)
  • Clinical photoconvulsive seizures or subclinical photoparoxysmal responses occur when an individual is exposed to intermittent light stimulation (ILS), consisting of flashes of light of a particular frequency. (medscape.com)
  • In contrast, reflex seizures represent a reproducible and time-dependent response to a specific stimulus. (medscape.com)
  • In addition to visually induced seizures, reflex seizures are also triggered by the activation of other primary sensory cortices, such as the primary auditory, or somatosensory cortices, but also by activation of premotor, pericingulate (SMA), and parietal lobe association cortices. (medscape.com)
  • Orofacial reflex myocloni (ORM) were the most frequent manifestation (68, 67.3% cases), other presentations, mostly in addition to ORM, included visual, sensory or cognitive symptoms, non-orofacial myoclonic seizures, and absence seizures. (bvsalud.org)
  • Epileptic seizure types and precipitating stimuli for reflex seizures (website), May 13, 2009. (clinicalgate.com)
  • IPS is often used in conjunction with other controllable generators of visual stimuli, such as low-level visual stimulation LLVS. (wikipedia.org)
  • Patient with hypersecretion of the gastric juices was recomended to exclude from the diet concentrated bouillons and vegetable decoctions because of their stimulation of gastric secretion. (eneutron.info)
  • What is dominating mechanism of stimulation of secretion in this case? (eneutron.info)
  • 16 rats with bilaterally severed sciatic nerves were divided into two groups for different modes of stimulation. (maxwellmagneticmeds.co.za)
  • Retinal ganglion cells vary significantly in terms of their size, connections, and responses to visual stimulation but they all share the defining property of having a long axon that extends into the brain. (eyewire.org)
  • Since many, if not all, changes in the nervous system gain expression in one way or another, through the salivary reflex, why not, Pawlow asks, investigate these processes by observing their relation to this particular reflex? (yorku.ca)
  • 5 ] have shown that light can reset the circadian clock as well as stimulate the iris light reflex of genetically-manipulated mice without classical photoreceptors (rods and cones). (biomedcentral.com)
  • their axons form the retinohypothalamic tract and contribute to circadian rhythms and pupillary light reflex, the resizing of the pupil. (eyewire.org)
  • Through the pterygopalatine ganglion, this causes ocular vasodilation and activation of ocular trigeminal afferents through the trigemino-autonomic reflex [85]. (researchgate.net)
  • Visual stimulation in photosensitive individuals leads to activation of IEDs in the frontoparietal cortices. (medscape.com)
  • Sneezing is a biological reflex signaled by the brain to clear the mucus lining of foreign contaminants, in order to effectively reset the nasal environment. (drmayankshukla.com)
  • Since obstructive events occur more commonly at wake-sleep transitions and during rapid eye movement (REM) sleep than during stable NREM sleep, we assessed the GG reflex during these two vulnerable states. (lookformedical.com)
  • The influence of pulsed magnetic stimulation on denervated muscles was investigated in this study. (maxwellmagneticmeds.co.za)
  • Its benefits of painless stimulation as well as deeply activated muscular contraction could be expected to function as a new model for rehabilitation of paralyzed muscles. (maxwellmagneticmeds.co.za)
  • The electric response evoked in the cerebral cortex by visual stimulation or stimulation of the visual pathways. (lookformedical.com)
  • While it's actually light, not heat, which triggers the sneezing, Aristotle proves that photic sneezing has a rich history of puzzling humankind. (drmayankshukla.com)
  • The chemical property of food, whereby it acts upon the receptors of the mouth of the dog, is an 'essential' property, for it invariably causes a salivary reflex. (yorku.ca)
  • Disclaimer: Reflex sympathetic dystrophy syndrome (RSDS) definition / meaning should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a legal, medical, or any other professional. (definithing.com)
  • Pawlow has termed reflexes in response to 'essential' properties 'unconditioned,' and those in response to 'non-essential' properties 'conditioned. (yorku.ca)
  • The GG reflex response to pulses of -8 cmH2O choanal pressure applied via nose mask during early inspiration was quantified repeatedly during relaxed wakefulness, within five breaths of wake-sleep transition (EEG alpha-theta transition) and during REM sleep. (lookformedical.com)
  • 3. During wakefulness there was brisk GG reflex activation in response to negative pressure (amplitude: +78.5 +/- 28.3 % baseline (mean +/- s.e.m. (lookformedical.com)
  • It consists in the quantitative study of those modifications of the salivary reflex which are conditioned by complex receptive and elaborative processes (psychic reactions) in the central nervous system. (yorku.ca)
  • It was Pawlow's idea that the perfectly constant and dependable 'unconditioned' salivary reflex might be used to advantage as a basis for the investigation of those complex nervous processes one of whose expressions is a 'conditioned' reflex of the same glands. (yorku.ca)
  • It could also be a sign that you have ongoing or chronic nasal stimulation or inflammation , possibly as a result of allergies . (girlwithanswers.com)
  • Increasing evidence shows that extremely low frequency electromagnetic fields (ELF-EMFs) stimulation is able to exert a certain action on autoimmunity and immune cells. (maxwellmagneticmeds.co.za)
  • While bothersome, photic sneezing does not pose any real medical danger, and thus not much funding has been devoted to its scientific investigation. (drmayankshukla.com)
  • Photic sneezing in and of itself does not pose any medical danger, nor is it a symptom of an underlying medical condition. (drmayankshukla.com)
  • Reflex epilepsies are relatively rare, occurring in only 5% of all epilepsies. (medscape.com)
  • Transcranial electromagnetic brain stimulation is a non-invasive novel technique used recently to treat different neurodegenerative disorders, in particular Alzheimer's disease. (maxwellmagneticmeds.co.za)
  • Despite its proven value, the mechanisms through which EMF brain-stimulation exerts its beneficial action on neuronal function remains unclear. (maxwellmagneticmeds.co.za)
  • and second, to familiarize American investigators with the salivary reflex method and hasten the time when it shall be as advantageously used in this country as it now is in Russia. (yorku.ca)
  • Magnetic stimulation, used as a method that induces muscular activity, was verified in this study as being capable of retarding denervated muscular atrophy. (maxwellmagneticmeds.co.za)
  • The results indicate that significant glutamatergic neurotransmission remains in ipRGCs of Opn4 Cre/+ ;vGlut2 loxP/loxP mice and that the ipRGC vGlut2 conditional knock-out (cKO) model resulted in only subtle changes in the rate of vesicular glutamate replenishment even at high stimulation frequencies. (eneuro.org)
  • Convulsions produced in rodents by pentylenetetrazol or, to a lesser extent, electrical stimulation are antagonized, as are convulsions produced by photic stimulation in susceptible baboons. (nih.gov)