Mehdi Sanayei

Mehdi Sanayei
Institute for Research in Fundamental Sciences (IPM) | IPM · School of Cognitive Sciences

MD, PhD

About

17
Publications
1,712
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186
Citations

Publications

Publications (17)
Article
Full-text available
Perceptual learning, the improvement in perceptual abilities with training, is thought to be mediated by an alteration of neuronal tuning. It remains poorly understood how tuning properties change as training progresses, whether improved stimulus tuning directly links to increased behavioural readout of sensory information, or how population coding...
Article
Full-text available
Attention affects neuronal processing and improves behavioural performance. In extrastriate visual cortex these effects have been explained by normalization models, which assume that attention influences the circuit that mediates surround suppression. While normalization models have been able to explain attentional effects, their validity has rarel...
Article
Full-text available
‘Stimulus roving’ refers to a paradigm in which the properties of the stimuli to be discriminated vary from trial to trial, rather than being kept constant throughout a block of trials. Rhesus monkeys have previously been shown to improve their contrast discrimination performance on a non-roving task, in which they had to report the contrast of a t...
Conference Paper
While the physics of local field potential (LFP) generation are well-established, the complexity of neural network dynamics means that interpreting LFP measurements in terms of the underlying neural activity is very difficult [1]. Recent studies have therefore investigated forward models of the LFP: calculating the LFP due to known arrangements of...
Conference Paper
Local field potentials (LFPs), measured using extracellular electrodes, provide information about local neuronal population activity. The development of multi-electrode arrays (MEAs) that measure LFPs simultaneously at different network locations has led to a renewed interest in the LFP as a measure of neuronal network activity [1]. While there is...
Article
Full-text available
Local field potentials (LFPs) sampled with extracellular electrodes are frequently used as a measure of population neuronal activity. However, relating such measurements to underlying neuronal behaviour and connectivity is non-trivial. To help study this link, we developed the Virtual Electrode Recording Tool for EXtracellular potentials (VERTEX)....
Article
Full-text available
Rhesus monkeys underwent training in a contrast discrimination task, in which grating stimuli were presented at parafoveal and peripheral visual field locations. Subjects had to compare a sample stimulus that had a fixed contrast of 30% to a test stimulus that varied in contrast from trial to trial. Extensive practice yielded improvements in contra...
Article
Full-text available
Attention improves perception by affecting different aspects of the neuronal code. It enhances firing rates, it reduces firing rate variability and noise correlations of neurons, and it alters the strength of oscillatory activity. Attention-induced rate enhancement in striate cortex requires cholinergic mechanisms. The neuropharmacological mechanis...
Conference Paper
Spatial transfer of visual-form adaptation across saccadic eye movements has been a debate in recent years. In our study, we wanted to demonstrate if there is spatial aftereffect either for viewpoint aftereffects or identity-based aftereffects (after adaptation to an anti-face, an average face is identified as the face opposite to the anti-face wit...
Conference Paper
There is a debate whether attention sharpens tuning function of processing units to play its role in enhancement of visual processing. Using an adaptation paradigm, we tried to investigate changes in orientation tuning in attended and non-attended conditions. In the first experiment, we showed that the magnitude of tilt aftereffect (TAE) for a 90°...
Article
Flash-lag illusion is one of the most robust visual illusions which has opened out new challenges recently. In this study, to find out the mechanisms responsible for this illusion we compare the flash lag illusion in two different conditions: the dichoptic display and the normal display. In the dichoptic display the measured flash-lag illusion was...

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Project (1)
Project
In this study by using psychophysics tasks we research on the impairment of working memory (WM) in patients with multiple sclerosis (MS) to find new insights towards the relationship between different aspects of MS related-fatigue and cognitive deficit with the main focus on working memory impairment.