No Colavita effect: equal auditory and visual processing in people with one eye

• Published in: Experimental brain research 2012-02, Vol.216 (3), p.367-373
• Main Authors: Moro, Stefania S., Steeves, Jennifer K. E.
• Format: Article
• Language: English
• Subjects: Acoustic Stimulation - methods; Adaptation; Adolescent; Adult; Auditory discrimination; Auditory perception; Auditory Perception - physiology; Auditory stimuli; Binocular vision; Biological and medical sciences; Biomedical and Life Sciences; Biomedicine; Blindness; Brain research; Cataracts; Cortex; Dominance; Ear and associated structures. Auditory pathways and centers. Hearing. Vocal organ. Phonation. Sound production. Echolocation; Enucleation; Eye; Eye and associated structures. Visual pathways and centers. Vision; Female; Fixation, Ocular; Functional Laterality - physiology; Fundamental and applied biological sciences. Psychology; Humans; Information processing; Male; Neurology; Neurosciences; Photic Stimulation - methods; Physiological aspects; Reaction Time - physiology; Recruitment; Research Article; Senses; Sensory integration; Sensory neurons; Signal Detection, Psychological; Vertebrates: nervous system and sense organs; Vision; Vision, Ocular - physiology; Visual discrimination; Visual perception; Visual Perception - physiology; Visual stimuli; Young Adult
• ISSN: 0014-4819; 1432-1106
• DOI: 10.1007/s00221-011-2940-4

Previous research has shown that people with one eye have enhanced spatial vision implying intra-modal compensation for their loss of binocularity. The current experiments investigate whether monocular blindness from unilateral eye enucleation may lead to cross-modal sensory compensation for the loss of one eye. We measured speeded detection and discrimination of audiovisual targets presented as a stream of paired objects and familiar sounds in a group of individuals with monocular enucleation compared to controls viewing binocularly or monocularly. In Experiment 1, participants detected the presence of auditory, visual or audiovisual targets. All participant groups were equally able to detect the targets. In Experiment 2, participants discriminated between the visual, auditory or bimodal (audiovisual) targets. Both control groups showed the Colavita effect, that is, preferential processing of visual over auditory information for the bimodal stimuli. The monocular enucleation group, however, showed no Colavita effect, and further, they demonstrated equal processing of visual and auditory stimuli. This finding suggests a lack of visual dominance and equivalent auditory and visual processing in people with one eye. This may be an adaptive form of sensory compensation for the loss of one eye and could result from recruitment of deafferented visual cortical areas by inputs from other senses.