Psycholinguistics (2018), 24(1), 134–148 134 psycholing-journal.com ISSN 2309-1797 (print) / 2415-3397 (online) doi: 10.31470/2309-1797-2018-24-1-134-148 УДК 376:(616.89-008.47+616-008.61) Neuro-cognitive Underpinning of Co-morbidity between Developmental Dyslexia and Attention-Deficit Hyperactivity Disorder (ADHD) Нейрокогнітивні основи коморбідності вікової дислексії та гіперактивного розладу з дефіцитом уваги (ГРДУ) Larysa Zasiekina Ph.D. in Psychology, Professor Full Professor in Psychology, Fulbright (USA) and Chevening (UK) Scholar Лариса Засєкіна доктор психологічних наук, професор, стипендіат програм імені Фулбрайта (США) та Чівнінг (Велика Британія) E-mail: lora.zasyekina@gmail.com orcid.org/0000-0001-8456-0774 Reseracher ID: C-3244-2016 National University «Ostroh Academy»  2, Seminarskya Str., Ostroh, Ukraine, 35800 Національний університет «Острозька академія»  вул. Семінарська, 2, Острог , Україна, 35800 Original manuscript received April 02, 2018 Revised manuscript accepted October 24, 2018 ABSTRACT Developmental Dyslexia is a specific reading and writing disability despite of normal intelligence, educational instruction and socio-cultural opportunity. Attention-deficit hyperactivity disorder (ADHD) is a condition that affects millions of children and often persists into adulthood. ADHD can include a combination of problems, such as difficulty sustaining attention, hyperactivity and impulsive behaviour. The frequent co-morbidity of dyslexia and ADHD posed the question of the issue whether common causal mechanism can be identified. There are several causal explanation of the co-morbidity between