Hamish Meffin

Quantifying visual acuity for pre-clinical testing of visual prostheses

Martin Spencer, Tatiana Kameneva, David B Grayden, Anthony N Burkitt, Hamish Meffin

Journal article  |  2023  |  JOURNAL OF NEURAL ENGINEERING

Objective.Visual prostheses currently restore only limited vision. More research and pre-clinical work are required to improve the..

Orientation pinwheels in primary visual cortex of a highly visual marsupial

Young Jun Jung, Ali Almasi, Shi H Sun, Molis Yunzab, Shaun L Cloherty, Sebastien H Bauquier, Marilyn Renfree, Hamish Meffin, Michael R Ibbotson

Journal article  |  2022  |  SCIENCE ADVANCES

Primary visual cortices in many mammalian species exhibit modular and periodic orientation preference maps arranged in pinwheel-li..

Preferential modulation of individual retinal ganglion cells by electrical stimulation

Molis Yunzab, Artemio Soto-Breceda, Matias Maturana, Stephanie Kirkby, Maximilian Slattery, Anton Newgreen, Hamish Meffin, Tatiana Kameneva, Anthony N Burkitt, Michael Ibbotson, Wei Tong

Journal article  |  2022  |  JOURNAL OF NEURAL ENGINEERING

Objective.Retinal prostheses have had limited success in vision restoration through electrical stimulation of surviving retinal ga..

How Stimulus Statistics Affect the Receptive Fields of Cells in Primary Visual Cortex

Ali Almasi, Shi Hai Sun, Molis Yunzab, Young Jun Jung, Hamish Meffin, Michael R Ibbotson

Journal article  |  2022  |  JOURNAL OF NEUROSCIENCE

We studied the changes that neuronal receptive field (RF) models undergo when the statistics of the stimulus are changed from thos..

Neural activity shaping utilizing a partitioned target pattern

Martin J Spencer, Tatiana Kameneva, David B Grayden, Anthony N Burkitt, Hamish Meffin

Journal article  |  2021  |  JOURNAL OF NEURAL ENGINEERING

Electrical stimulation of neural tissue is used in both clinical and experimental devices to evoke a desired spatiotemporal patter..

Analysis of extracellular spike waveforms and associated receptive fields of neurons in cat primary visual cortex

Shi H Sun, Ali Almasi, Molis Yunzab, Syeda Zehra, Damien G Hicks, Tatiana Kameneva, Michael R Ibbotson, Hamish Meffin

Journal article  |  2021  |  JOURNAL OF PHYSIOLOGY-LONDON

KEY POINTS: Extracellular spikes recorded in the visual cortex (Area 17/18, V1) are commonly classified into either regular-spikin..

Learning receptive field properties of complex cells in V1

Yanbo Lian, Ali Almasi, David B Grayden, Tatiana Kameneva, Anthony N Burkitt, Hamish Meffin

Journal article  |  2021  |  PLOS COMPUTATIONAL BIOLOGY

There are two distinct classes of cells in the primary visual cortex (V1): simple cells and complex cells. One defining feature of..

High Fidelity Bidirectional Neural Interfacing with Carbon Fiber Microelectrodes Coated with Boron-Doped Carbon Nanowalls: An Acute Study

Maryam A Hejazi, Wei Tong, Alastair Stacey, Shi H Sun, Molis Yunzab, Ali Almasi, Young Jun Jung, Hamish Meffin, Kate Fox, Khatereh Edalati, Athavan Nadarajah, Steven Prawer, Michael R Ibbotson, David J Garrett

Journal article  |  2020  |  ADVANCED FUNCTIONAL MATERIALS

Implantable electrodes that can communicate with a small, selective group of neurons via both neural stimulation and recording are..

Mechanisms of Feature Selectivity and Invariance in Primary Visual Cortex.

Ali Almasi, Hamish Meffin, Shaun L Cloherty, Yan Wong, Molis Yunzab, Michael R Ibbotson

Journal article  |  2020  |  Cerebral Cortex

Visual object identification requires both selectivity for specific visual features that are important to the object's identity an..

In vivofeasibility of epiretinal stimulation using ultrananocrystalline diamond electrodes

Mohit N Shivdasani, Mihailo Evans, Owen Burns, Jonathan Yeoh, Penelope J Allen, David AX Nayagam, Joel Villalobos, Carla J Abbott, Chi D Luu, Nicholas L Opie, Anu Sabu, Alexia L Saunders, Michelle McPhedran, Lisa Cardamone, Ceara McGowan, Vanessa Maxim, Richard A Williams, Kate E Fox, Rosemary Cicione, David J Garrett, et al.

Journal article  |  2020  |  JOURNAL OF NEURAL ENGINEERING

OBJECTIVE: Due to their increased proximity to retinal ganglion cells (RGCs), epiretinal visual prostheses present the opportunity..