Volume 30 #1

Contents

1. Protanomaly: Possibilities for compensation and color discrimination training
2. Visual acuity dependence on refraction: diversity ambiguity of impact
3. Effects of temporal and spatial features of visual stimulation on saccades in normal controls and parkinsonian patients
4. Individual data on visual acuity and accommodation after training of accommodation under control of convergence in patients with myopia and hypermetropia
5. Eye movement parameters are influenced by cognitive task in viewing of static and dynamic scenes
6. Acoustic brainstem evoked potentials as the evaluation tool for the functional state of the central nervous system in children with disseminated encephalomyelitis
7. Frequency organization of the auditory receptor complex in midges (Chironomidae, Diptera)
8. Multisensory information processing in visual, auditory and gustatory sensory systems with involvement of infraslow brain potential oscillations

We studied effects of spatial and temporal features of visual stimulation on saccadic eye movement’s parameters in young and older healthy volunteers and patients with early stages of Parkinson’s disease. Three stimulation paradigms were used: no delay, overlap and gap. The visual targets were located to the right and left, up and down from the central stimulus. Our findings have demonstrated that the temporal characteristics of stimulation had significant effects on saccadic latency and duration in all the groups of participants. The factor of spatial location of visual targets had less pronounced influence on latency and duration of saccades than the temporal factor. Spatial asymmetry of saccadic parameters was associated with individual properties of the participants, age and disease factors. Patients with Parkinson’s disease had longer saccadic latencies, produced gap effect with smaller magnitude and performed much more multistep saccades then age-matched controls. The degree of saccadic abnormalities demonstrated by parkinsonian patients depended both on stimulation paradigm and on spatial location of visual targets.

Key words: saccades, gap effect, asymmetry, Parkinson’s disease

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