ACCESS-ABILITY Volume3_Issue1 - Page 28

INTRODUCING Wh at is Lexplor e? It ?s a n ew m et h od f or assessin g r eadin g t h at em ploys ar t if icial in t elligen ce an d eye-t r ack in g t ech n ologies. Eye m ovem en t s can of f er clear in sigh t s in t o h ow a ch ild appr oach es a r eadin g passage. By t r ack in g eye f ixat ion s (t h e len gt h of t im e t h e eye r est s on a w or d) an d saccades (r apid m ovem en t of t h e eye bet w een f ixat ion poin t s), Lexplor e can qu ick ly an d ef f icien t ly det er m in e h ow a ch ild?s br ain is pr ocessin g pr in t . Con t r ar y t o popu lar belief , st r on g r eader s pr ocess each let t er ser ially. As t h e r eader develops a st r on g w or d f or m ar ea in t h e br ain t h r ou gh en gagin g in decodin g, t h e pr ocess becom es m or e ef f icien t . Ef f icien cy is gain ed t h r ou gh speed, t h en even t u ally by pr ocessin g com m on let t er bigr am s, an d f in ally by pr ocessin g t h ese let t er sequ en ces in par allel. Alt h ou gh t h er e is an illu sion of ?w h ole w or d? r eadin g, t h is is n ot h ow ou r eyes f ixat e on pr in t , n or is it h ow w e decode w or ds. Becau se eye t r ack in g t ech n ology can m ap saccades du r in g silen t r eadin g, it can pick u p an om alies in t h e w ay a ch ild pr ocesses pr in t f eat u r es. Th e Lexplor e algor it h m is based on a lar ge dat abase of eye t r ack in g dat a t h at h as been ?t r ain ed,? t h r ou gh m ach in e lear n in g, t o r ecogn ize cor r elat ion s bet w een eye m ovem en t an d r eadin g abilit y. In f act , t h e r esear ch er s beh in d Lexplor e h ave been able t o sh ow t h at t h eir st at ist ical m odels can pr edict r eadin g dif f icu lt ies w it h 95.6% accu r acy af t er on ly 30 secon ds of r eadin g! M or eover , w e can