Glossary of Dyslexia Related Words
		Agraphia -- loss of the ability to write Alexia -- a form of sensory aphasia resulting in the loss of the ability to read; word blindness Ambidextrous -- possessing the ability to work effectively with either hand Anterior genu-- describes the forward region of the corpus collosum Aphasia -- Absence or impairment of the ability to communicate through speech, written, or sign language due to dysfunction of brain centers Autoimmune Disease -- a disease in which the immune system erroneously attacks self-cells Cerebral Vascular Accident-- a rupture of a blood vessels in the brain Chromosomes -- structures located in the nucleus of the cell that contain DNA which transmits genetic information; this information codes for all human qualities and characteristics Concordance Rates -- Statistical analysis on twin studies which determines the extent to which twins are similar; low rates = not similar (or environmentally influenced), high rates = similar (genetically influenced) Congenital defects-- an abnormality presented at birth Corpus Collosum -- bundle of nerves which run between the left and right lobes and thus, enable the two lobes to communicate Dizygotic Twins -- fraternal twins who stem from two eggs and two sperm Genetic Predisposition -- creates a greater risk of displaying a particular characteristic or a certain disorder due to the inherited genetic composition Hereditary Traits-- genetic characteristic transmitted from parent to offspring Heterogeneous Condition -- A condition caused by more than one chromosome Interhemispheric Communication -- communication between the left and right lobes of the brain Magnocellular -- a layer in the LGN that provides infor about form, movement, depth, and modulation of constrast sensitivity Magnocellular Pathway -- neuronal pathway that connects the retina (eye) to the occipital and parietal lobes of the brain (regions of the brain that process, in part, visual and auditory information); transfers information pertaining to objects in motion Monozygotic twins -- identical twins who stem from one egg and one sperm Parvocellular -- a layer in the LGN that provides info about color and fime details Parvocellular Pathway -- coincides with the magnocellular pathway to form the lateral geniculate nucleus; transfers information which describes objects Posterior -- describes the back end of a region Sensory aphasia -- Inability to understand spoken words if auditory center is affected (auditory aphasia) or the written word if visual center is affected (visual aphasia) Strephosymbolia -- difficulty in distinguishing between letters that are similar but face opposite directions Ex: p-g and b-d Vestibullary -- sense of balance Wordblindness-- a form of sensory aphasia resulting in the loss of the ability to read; alexia