I. Introduction
Developmental dyslexia is a neurodevelopmental disorder that is characterized by impairment in accurately recognizing, processing and decoding phrases and phonemes despite adequate intelligence, motivation and no sensory impairments [1], [2]. There is a strong association between dyslexia and impairments in phonological awareness [3], [4]. It affects about 15-20% of the total world population which is a serious concern [5]. In India, its prevalence rate is believed to be about 15% [6]. In addition to phonological deficits, they have deficits in the domain of visuo-spatial attention and in sustaining attention on non- verbal objects [7] [8]. The visual-spatial attention shortfalls in dyslexics are due to a specific difficulty in orienting, focusing and sustaining attention [9]. The auditory and visual abnormalities shown by dyslexics share a common problem in the perceptual choosing of thus providing evidence of a multimodal temporal processing deficit in dyslexia [10]. Electroencephalography (EEG) is a non- invasive method to measure the electrical activity of the brain [11] through electrodes placed on the scalp that capture the potential developed due to the synchronized activity of the firing neurons [12]. This paper aims to quantify the visual-spatial attention deficits in dyslexics using theta/alpha ratio as the dependent variable and comparing its values during task and rest spanned across the various brain lobes.