A5007101967- Visual perception and processing mechanisms
- Neural and Behavioral Psychology Studies
- Neural dynamics and brain function
- Ophthalmology and Visual Impairment Studies
- Neuroscience and Music Perception
- Retinal Imaging and Analysis
- Cognitive and developmental aspects of mathematical skills
- Spatial Neglect and Hemispheric Dysfunction
- Visual Attention and Saliency Detection
- Multisensory perception and integration
- Reading and Literacy Development
- Psychological and Temporal Perspectives Research
- Behavioral and Psychological Studies
- Neuroendocrine regulation and behavior
- Nicotinic Acetylcholine Receptors Study
- Color Science and Applications
- Neurobiology and Insect Physiology Research
- bioluminescence and chemiluminescence research
- Tactile and Sensory Interactions
- Stress Responses and Cortisol
- Autism Spectrum Disorder Research
- Olfactory and Sensory Function Studies
- Mental Health Research Topics
- Categorization, perception, and language
- Child and Animal Learning Development
Free University of Tbilisi
2018-2025
Marina Del Rey Hospital
2021
Agricultural University of Georgia
2014-2019
University of Georgia
2015
Tbilisi State University
2010
Georgian National Academy of Sciences
2005
Despite well-established sex differences for cognition, audition, and somatosensation, few studies have investigated whether there are also in visual perception. We report the results of fifteen perceptual measures (such as acuity, backward masking, contrast detection threshold or motion detection) a cohort over 800 participants. On six tests, males significantly outperformed females. no test did females outperform males. Given this heterogeneity effects, it is unlikely that due to any...
Bioluminescent imaging (BLI) is one of the most powerful and widely used preclinical modalities. However, current technology relies on use transgenic luciferase-expressing cells animals therefore can only be applied to a limited number existing animal models human disease. Here, we report development "portable bioluminescent" (PBL) that overcomes major limitations traditional BLI. We demonstrate PBL method capable noninvasive measuring activity both extracellular (e.g., dipeptidyl peptidase...
The world's population is aging at an increasing rate. Even in the absence of neurodegenerative disorders, healthy affects perception and cognition. In context cognition, common factors are well established. Much less known about for vision. Here, we tested 92 older 104 younger participants 19 visual tests (including search contrast sensitivity) three cognitive verbal fluency digit span). Unsurprisingly, performed better than almost all tests. Surprisingly, however, performance was mostly...
Vision scientists have tried to classify illusions for more than a century. For example, some studies suggested that there is unique common factor all visual illusions. Other proposed are several subclasses of illusions, such as linear extent or distortions. We previously observed strong within-illusion correlations but only weak between-illusion correlations, arguing in favor an even higher multifactorial space with—more less—each illusion making up its own factor. These mixed results...
#TheDress is remarkable in two aspects. First, there a bimodal split of the population perception dress's colors (white/gold vs. black/blue). Second, whereas interobserver variance high, intra-observer low, i.e., percept rarely switches given individual. There are plausible routes explanations: either one-shot learning during first presentation image splits observers into different, stable populations, or differences caused by traits observers, such as different visual systems. Here, we hid...
Nicotine is an important stimulant that involved in modulating many neuronal processes, including those related to vision. also thought play a key role schizophrenia: A genetic variation of the cholinergic nicotine receptor gene, alpha-7 subunit (CHRNA7) has been shown be associated with stronger backward masking deficits schizophrenic patients. In this study, we tested visual healthy smokers and non-smokers further understand effects on spatiotemporal first 48 participants, group (n = 12)...
Gender differences are well established in cognition and somato-sensation, but there almost no studies on gender visual perception. In vision experiments, sample size of participants is often small because effect sizes large. However, samples not suited to test for differences. Here, we pooled data from 4 resulting 1091 ranging age 14 90 years. We tested participants' performance vernier acuity, backward masking the Wisconsin Card Sorting Test. found any four tests younger (n=431; 14-30...
Abstract Whereas much is known about the degenerative effects of aging on cortical tissue, less how affects visually evoked electrical activity, and at what latencies. We compared visual processing in elderly young controls using a masking paradigm, which particularly sensitive to detect temporal deficits, while recording EEG. The results show that, average, have weaker potentials than controls, that distinct scalp potential topography (microstate) around 150 ms after stimulus onset. This...
The developed world is aging faster than ever before. Even in the absence of neurodegenerative disease, affects all kinds human functions including perception and cognition. In most perceptual studies, one paradigm tested it usually found that older participants perform worse younger participants. Implicitly, these results are taken as evidence there factor for each individual determining his/her overall performance levels. Here, we show visual cognitive age differently. We 131 (mean 70...
Introduction Recent work has shown an association between cognitive and visual impairments two main theories were advanced, namely the sensory deprivation common cause theories. Most studies considered only basic functions such as acuity or field size evaluated with dementia.Objectives To reconcile these to test link decline in mildly impaired people.Methods We employed a battery of 19 tasks on 39 older adults mild impairment 91 without any evidence decline, measured by Montreal Cognitive...
Objectives: We studied timed-based expectancy as well general perceptual-motor speed in children with autism spectrum disorder (ASD).Methods: In Experiment 1, 11 ASD and typically developing (TD) (6–13 years) completed a binary choice response task which foreperiod duration predicted the target's location probability of 0.8. 2, we compared performance between 10 (6–11 TD by using simple reaction time test.Results: Employing forced where pre-target interval (800 or 1400 ms) probabilistically...
The ability to form time-based event expectancies is one of the most important determinants anticipative behavior. aim present study was determine whether healthy aging influences formation expectancies. Ten older adults with ages ranging between 60 and 73 years ten younger 20 32 participated. We employed a binary choice response task mimicking computer game, in which two target stimuli pre-target intervals appeared overall equally often. One targets paired short interval other long 80%...
The standard physiological model has serious problems accounting for many aspects of vision, particularly when stimulus configurations become slightly more complex than the ones classically used, e.g., Gabors rather only one or a few Gabors. For example, as shown in publications, crowding cannot be explained with most models crafted spirit approach. In crowding, target is neighbored by flanking elements, which impair discrimination. However, flankers are added, performance can improve...
Using batteries of visual tests, most studies have found that there are only weak correlations between the performance levels tests. Factor analysis has confirmed these results. This means a participant excelling in one test may rank low another test. Hence, is very little evidence for common factor vision. In aging research, cross-sectional repeatedly healthy older adults' strongly deteriorated tests compared to young adults. However, also within population, no factor. To investigate...