This week we evaluated the functional specialization of the brain and if our mind moves before our eyes do regarding the article by Treue and Martinez (2003). There are two main pathways that deal with our visual perception, the Parvo pathway deals with color and detail, such as what is this object i am holding, what type of color is it, so we know the definition of objects and faces too. also called object perception, lesions on that pathway can relate to visual agnosia. The second one is the Magno pathway, which deals with motion, we know through that how to navigate and also seen as the where pathway. Problems on this spatial perceptions pathway are optic ataxia, which are mutations in reaching and grasping. People with brain lesions, cannot put the name towards an objects straight away. Injury or mutation that is related to one specific part of the brain, affects the process of storing and releasing information. different experiments have been conducted to track exe movement, measuring the suppression in our visual system. These also record fixation, as when the participant looks at the picture, it records on what part of the picture the participants eyes are concentrating on. So it could be said that our attention filters our recognition and responds to it. It is like a concept of fluent energy when being conscious. Is there a limited capacity of attention we can observe or naturally have? As I imagend that our attention works like a memory card, and when things are not neccessary any more they are erased. However there are some attention impairments such as Agnosia and Memory loss. Agnosia is the impairment of recognition, its like "ignorance" of basic objects, due to injury in the brain. In visual agnosia the patient know that something is going on and an object there but its hard for them to place, identify and cannot see anything. Next week we will be talking about Prosopagnosia also seen as face blindness, where the essay question is on.
I will now address some short answers to the questions that were discussed in the seminar to the article "cognitive Physiology: Moving the Mind´s eye before the Heads eye" by Treue and Martinez (2003). I also have read in the Neuropychology Textbook and some additional reading for this topic., with what i answered these questions.
1. Why do we need to move our eyes across a scene?
Our high spatial resolution is confirmed to a small fraction of the retrain, the fovea. This is a dedicated motor system, as we in general don't see everything at once. The retrain periphery covers a large amount of the visual environment and can monitor for high contrast, low spatial frequency and fast changing.
2. Would it not be easier if we could see the whole scene at once?
Possibly yes, but implementing the foveal resolution abilities across the whole retrina, it would be enourmously stressful and very difficult resulting in the flood of information reaching the brain would be impossible to process, react and deal with the approaching situation at once.
3. What does FEF mean?
FEF means the "fractal eye field", an area in the frontal cortex involved in the generation, that coordinates the pointing and directing the eyes across one presented scene. FEF plays a central role in the directed spatial attention of the human brain and is directly linked to the generation of eye movement commands when FEF is activated the eye movement is triggered.
I will now address some short answers to the questions that were discussed in the seminar to the article "cognitive Physiology: Moving the Mind´s eye before the Heads eye" by Treue and Martinez (2003). I also have read in the Neuropychology Textbook and some additional reading for this topic., with what i answered these questions.
1. Why do we need to move our eyes across a scene?
Our high spatial resolution is confirmed to a small fraction of the retrain, the fovea. This is a dedicated motor system, as we in general don't see everything at once. The retrain periphery covers a large amount of the visual environment and can monitor for high contrast, low spatial frequency and fast changing.
2. Would it not be easier if we could see the whole scene at once?
Possibly yes, but implementing the foveal resolution abilities across the whole retrina, it would be enourmously stressful and very difficult resulting in the flood of information reaching the brain would be impossible to process, react and deal with the approaching situation at once.
3. What does FEF mean?
FEF means the "fractal eye field", an area in the frontal cortex involved in the generation, that coordinates the pointing and directing the eyes across one presented scene. FEF plays a central role in the directed spatial attention of the human brain and is directly linked to the generation of eye movement commands when FEF is activated the eye movement is triggered.
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