The role of p-stream cells and m-stream cells is evident if object identification and detection. The time taken to detect the object decreases, on the basis of stimuli given as well as the activeness of p stream or m stream cells. The experiment should be designed such that confounding elements are eliminated and result findings are applicable.The role of p-stream cells and m-stream cells is evident if object identification and detection. The time taken to detect the object decreases, on the basis of stimuli given as well as the activeness of p stream or m stream cells. The experiment should be designed such that confounding elements are eliminated and result findings are applicable.
Visual Attention to Color
Vital Attention to Color
Name the independent and dependent variables used; include the levels of each variable
The independent variable in this study is the color vision. The dependent variable is target detection and identification.
Are there any methodological flaws or limitations in the experimental design? Explain.
The study is designed across proper research lines and there are no apparent flaws or limitations in the method however, it's suggested that a more detailed literature review and secondary sources analysis would have helped a lot more. The study could have focused to guide how the noise factors can be systematically removed. It could elaborate the steps that were used by the researcher to minimize the effects of noise factors or the confounding variables. In the absence of this detail the new research will not be guided enough and other researchers will need to find and establish those steps themselves.
How did the experimenters control for possible confounding variables? '
There are personality influences related to the color vision. These could serve as confounding variables. The researcher did not survey those subjects with personality issues for understanding color vision to avoid confounding variables (Snowden, 2002). The patients having symptoms of schizophrenia were not included to that the color vision is focused and object detection not the psychological association of disease and motion detection.
4. Explain the role of the magnocellular and parvocellular streams (from what you learned from lecture or from your textbook). Explain how the research discussed in this article expands upon previous views.
Magnocellular cells and Parvocellular cells are neurons in thalamus. The cells are part of visual system and these cells have a critical role of defining visual perception plus they tell the motion and course of a body. The study enhanced my knowledge and guided how the cells help in detecting bodies in motion. The M-stream is the color-blind cells yet this study proved us that these cells play a major role in guiding attention and movement of the eye. The researches that were conducted earlier as well as the research that is under consideration suggests that Parvocellular cells of the P. stream has a bigger role in spatial resolution, yet it has a smaller temporal resolution as compare to the magnocellular cells. The cells' function combine to offer a very profound response detecting object details relevant to its speed as well as the distance and size of the object in the stimuli.
5. What are the implications of the author's findings? Relate your answer to a sensation or perception topic that you have learned about in this class
The author found that there is dominant role of M. stream in guiding attention and the movements of eye in case the stimuli only offer information regarding its color. The stream can also capture automatic attention. The sensation and perception of an individual can hence be automatic without requiring the control of person. Therefore it is possible that some people are more sensing and perceiving if they have more active M. stream cells. The p stream is color sensitive and supports accurate motion detection of an object or the stimuli. The combned role of both reduce the time taken for motion detection and accurate and quick identification of the object that is shown
6. Design an experiment to test whether the parvocellular stream is sensitive to motion processing
1) What methods would you use?
The experiment to test the parvocellular stream or P. stream will have twenty participants that will be observed for response to color vision. They will have normal visual acuity and color vision as assessed. Stimuli will be generated by Mat lab software with Psych Toolbox routines to give stimuli to a Sony Trinitron E220 cathode ray tube monitor. The environment of the experiment will be dark and the participants will be half a meter apart from monitor. A cube with 64 squares in color cab be shown moving, as a stimuli, to find participant responses.
2) What do you expect to find?
Since parvocellular neurons color sensitive and can find details of object, I expect that the participants will respond more quickly to the colored cube then they could respond to the uncolored object. The motion detection is expected to be quicker in presence of colors. The time taken to judge the location of the unchanging squares tells the role of motion and color I sense and perception. It is expected that the response time and the accuracy to detect object for the purpose of localization will be accurate and small. The results are expected to be aligned with asynchronous isoluminant color changes.
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