Recent content by sazr

Regarding human vision and the retina: Where are these channels produced? To put it simply, is it produced in the eye or in the brain. For example; does light enter the eye, hits the retina and it applies a series of filters to produce these 2 different channels (the parvo and magno) and it...

In regards to human vision and specifically the retina and ganglion cells. I find it hard to comprehend that somehow the light can only hit one part of the retinal ganglion cells (either the centre or the surround) and not the other? Doesn't light go everywhere? Is the lens focusing light so...

A while back I asked about human vision processing and if it is performed synchronously or asynchronously. One of the responses mentioned that the retina performs 'Center Surround Detection'. So I tried to google what this is but no relevant results came up. Is anyone able to explain what this...

Do we know what sort of preprocessing the retina does? And more importantly what the output of this preprocessing would look like? I'm interested from the perspective of computer vision uses, I can copy what the retina is doing to efficiently pre-process (and remove redundant information) and...

In computer vision we would apply a Sobel/Prewitt/etc. filter to the 1000x1000 image. And in that case we consider all 1 million data points, in this case, to detect edges. I was thinking, our way of edge detection (whilst works) is inefficient and the brain would have a more efficient way to...

The brain receives a lot of visual information some of which is redundant visual information. I am imagining it like the brain receiving a 1000 pixel wide by 1000 tall image of a road. The brain has received 1,000,000 bits/pixels of information. I am assuming the brain doesn't need all that...

Is most of human vision processing performed in a linear step-by-step fashion in the brain or is it concurrent? Let's take for example; for the process of us recognising a pen on a table. Light/information enters the eye, is focused on the fovea part of the retina because we are focusing on...

Do Rod photo-sensitive cells contribute at all to daytime vision? If so, what exactly do they contribute? For example, they contribute towards big homogenous shapes, slow moving big objects, etc. I'm interested in whether this applies to any animal not just humans.