Analysis of Retina Recognition by Correlation and Covariance Matrix

Kakarwal, S. N.; Deshmukh, Ratnadeep R.

doi:10.1109/icetet.2010.29

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…In this study, we investigated the effects of tACS stimulation on correlated firing among neighboring ganglion cells of the rabbit retina. As has been well described, synchronous and other firing correlations occur endogenously in nearby retinal ganglion cell pairs, and can be stimulus configuration-dependent, 22,26,27 as we also observed in this study. tACS stimulation affected both firing rates and cross-covariation of firing between nearby retinal ganglion cells, both during current application, and afterward.…”

Section: Discussionsupporting

confidence: 85%

“…Retinal ganglion cell covariance is thought to contribute to information flow to the visual cortex. 17,[22][23][24] Eye and Brain 2022:14…”

Section: Resultsmentioning

confidence: 99%

“…The high cross-covariance that can occur between nearby retinal ganglion cells 22,26,27 can be disrupted by tACS. In the cross-covariance plots in Figure 4B, there is a significant peak near zero delay in the baseline condition (top plot).…”

Section: Tacs Can Eliminate Prior High Cross-covariancementioning

confidence: 99%

“…In cases where endogenous oscillations were observed in pairs of retinal ganglion cells, the oscillations were preserved, but reduced, during and after tACS. Retinal ganglion cell covariance, 22 endogenous retinal oscillations induced by light step stimuli or flashes 23,24 and synchronized firing, or entrainment 24,25 are all thought to convey aspects of visual information to the visual cortex.…”

Section: Dovepressmentioning

confidence: 99%

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Effects of tACS-Like Electrical Stimulation on Correlated Firing of Retinal Ganglion Cells: Part III

Amthor¹,

Strang²

2022

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Purpose: Transcranial alternating current stimulation (tACS) is a stimulation protocol used for learning enhancement and mitigation of cognitive dysfunction. Correlated firing has been postulated to be a meta-code that links neuronal spike responses associated with a single entity and may be an important component of high-level cognitive functions. Thus, changes in the covariance firing structure of CNS neurons such as retinal ganglion cells are one potential mechanism by which tACS can exert its effects. Materials and Methods:We used microelectrode arrays to record light-evoked spike responses of 24 retinal ganglion cells in 7 rabbit eyecup preparations and analyzed the covariance between 30 pairs of neighboring retinal ganglion cells before, during, and after 10-minute application of alternating currents of 1 microampere at 10 or 20 Hz. Results: tACS stimulation significantly changed the covariance structure of correlated firing in 60% of simultaneously recorded retinal ganglion cells. Application of tACS in the retinal preparation increased cross-covariance in 26% of cell pairs, an effect usually associated with increased light-evoked ganglion cell firing. tACS associated decreases in cross-covariance occurred in 37% of cell pairs. Increased covariance was more common in response to the first, 10-minute application of tACS in isolated retina preparation. Changes in covariance were rare after repeated stimulation, and more likely to result in decreased covariance. Conclusion: Retinal ganglion cell correlated firing is modulated by 1 microampere tACS currents showing that electrical stimulation can significantly and persistently change the structure of the correlated firing of simultaneously recorded rabbit retinal ganglion cells.

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Section: Discussionsupporting

confidence: 85%

“…Retinal ganglion cell covariance is thought to contribute to information flow to the visual cortex. 17,[22][23][24] Eye and Brain 2022:14…”

Section: Resultsmentioning

confidence: 99%

Section: Tacs Can Eliminate Prior High Cross-covariancementioning

confidence: 99%

Section: Dovepressmentioning

confidence: 99%

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Effects of tACS-Like Electrical Stimulation on Correlated Firing of Retinal Ganglion Cells: Part III

Amthor¹,

Strang²

2022

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“…Tabatabaee [11] proposed combination of central Fourier-Mellin transform (FMT) harmonics and complex moment magnitudes as feature vectors and Fuzzy C-means clustering for classification. Even, simple correlation and covariance matrix based recognition method also exists [12] for retinal identification.…”

Section: State Of the Artmentioning

confidence: 99%

An Efficient Supervised Approach for Retinal Person Identification using Zernike Moments

Aich¹,

Mamun²

2013

IJCA

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Zernike moments map images using orthogonal basis functions. These moments have the advantages of rotation invariance, robustness and minimum information redundancy. In this paper, we focus on distinguishable pattern analysis of the retinal fundus images for person identification using Zernike moments. These moments are used to form 11-D feature vectors and k-nearest neighbor (kNN) classifier is used for person identification on publicly available DRIVE and STARE databases. This method outperforms all the existing methods with accuracy of 100% and 98.64% on DRIVE and STARE databases respectively. Its smaller dimension of feature vector, simplicity and robustness make this method suitable for real-time retinal person identification scheme.General Terms -Biometrics, security, pattern recognition.

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