Study into Mapping Blind Spots

Study into Mapping Blind Spots Though the blind spot is a part of the retina that is devoid of photoreceptors, therefore relaying no visual information, it does not lead to the experience of a dark hole in our visual field (Sakaguchi, 2001). This is due to the perceptual phenomenon of filling-in, whereby a visual attribute such as colour and brightness is perceived in the blind-spot, even though it only exists in the surround (Komatsu, 2006). A long-standing question has been whether perceptual filling-in ignores this absence of information or actively fills it in (De Weerd, 2006). The symbolic theory proposes that early visual areas only extract information at the surface border with the colour and shape of the surface reconstructed in higher areas (Komatsu, 2006). Conversely, the isomorphic theory assumes that the retinotopic map in the primary visual cortex (V1) receives information from the entire surface with visual features such as colour activated in early visual areas (De Weerd, 2006). Hence Komatsu (2006) proposes an amalgamation of the theories, that neural activity is higher along the edge of the blind-spot with these signals then spreading across a two-dimensional array of visual feature sensitive cells in early visual areas. Hence the mechanisms of filling-in depend upon activity along the physiological edge of the blind-spot as Spillmann, Ottee, Hamburger and Magnussen (2006) found that a ring as thin as 0.5 à ¯Ã¢â‚¬Å¡Ã‚ ° had been sufficient in inducing colour filling-in. Li et al., (2014) analysed this through 2.5à ¯Ã¢â‚¬Å¡Ã‚ ° mono-coloured annuli, finding that it filled in completely, providing evidence for active colour filling-in from a small border. Fahle and Schmid (1987) proposed that the mean distance between photoreceptors is slightly higher for the temporal side compared to the nasal side in the retina with the ganglion cells distributed in a similar asymmetrical fashion. This spatial arrangement of the image as it is processed within the retina is maintained in V1 (De Weerd, 2006). Hence Li et al., (2014) extended the study of homogenous stimuli to bi-coloured rings, revealing the presence of a retinotopic rule in perceptual filling-in that favours the nasal side. Whilst this validates rapid colour filling-in as preattentive, these spatial arrangements may be affected by other preattentive factors which contribute to global processes such as relative salience (Brown Thurmond, 1993). Hence the current study aimed to examine ambiguities in perceptual filling-in when responding to both lower and higher-level processes. More specifically, whether differences in the relative salience of bi-coloured annuli affected the nasal or temporal processing (retinotopic rule) in filling-in blind-spot. As Brown and Thurmond (1993) infer that relative salience contributes to higher processes, exposure to increased saturation may alter the retinotopic rule. Based on these two studies, it was hypothesised that the average choice probability for asymmetrical filling-in would decline as the relative saturation for the nasal side decreases. Reciprocally, it was hypothesised than asymmetrical choice probability would increase as relative saturation for the temporal side decreases. Method Participants Fifteen students from the University of Sydney (4 men, 11 women; M age = 21, SD = 2.03), participated voluntarily. All participants had normal or corrected-to normal vision. With the exception of the three experimenters, participants were naà ¯ve to the experiment. Materials Stimuli: All stimuli was generated using Microsoft PowerPoint Software. Stimuli consisted of bi-coloured (red and green) annuli, with a width of 2.5 ° (derived from Li et al., 2014). For each participant, the diameter of the stimuli was adjusted so that the annuli overlapped with the edge of the blind spot. The two halves of the bi-coloured annuli were juxtaposed symmetrically on the nasal and temporal sides of the blind spot. Each side was counterbalanced across trials wherein half the trials were comprised of nasal-red: temporal-green stimuli and the other half, nasal-green: temporal-red. The saturation was adjusted for one side to 100%, 50% or 25% of the original saturation, while the other half was maintained at 100% saturation (that is, 100:100, 100:50, 100:25, 50:100, 25:100). Controls used reversed stimuli, such that the fixation cross appeared on the right and the stimuli on the left. Thus, 36 randomised trials were conducted, consisting of six controls and three repeats of ten test stimuli (Appendix A1). Choice Panel: This illustrated the spread of the two colours in coloured disks and consisted of ten choices (refer to Appendix A2). Procedure The experiment was conducted over two sessions, one week apart. In the first session, the blind spot of each participant was mapped using Microsoft PowerPoint. Participants were seated in a dark room with a chin rest at a distance of .57m away from an ASUS S400c 14-inch screen. Participants were instructed to fixate on a white fixation cross presented on a black background with their right eye and left eye covered. Using a digital pen tool, a small white test dot was moved across the screen by the experimenter. The positions where the dot disappeared and reappeared were verbally reported by the participant and digitally marked when it was not visible. The process was repeated until the blind-spot had been mapped out adequately. In the second session, participant were asked to report the perceptual filling-in of the blind-spot. The fixation slide (5 sec) and the stimulus slide was presented (3 sec). Participants were then presented with the choice panel and asked to report the choice that best resembled what they observed. At the completion of the study, participants verbally reported their experiences with filling-in (Appendix B). Results Paired sample t-tests were conducted, with participants reporting nasal colour dominance significantly more often than either symmetrical filling-in, t(1,14) = 2.37, p =.03 (nasal red: M = 40.1%) and t(1,14) = 3.09, p M = 51.2%), or temporal colour dominance t(1,14) = 5.79, p M = 60.1%) and t(1,14) = 9.13, p M = 75.6%). A 5 x 2, repeated measure analysis of variance was carried out on colour and relative saturation on average choice probability for nasal dominance filling-in, after which quadratic trend contrasts were conducted. Averaged over relative saturation, choice probability for nasal dominance filling-in was significantly greater when the nasal colour was green than red (mean difference = 21.4%), F(1,14) = 15.30, p F(4, 56) = 3.56, p = .01. Quadratic trend contrasts revealed that this effect increased significantly as the nasal relative saturation increased from 25% to 100%, but decreased as relative saturation decreased from 100 to 25 on the temporal side, F(1,14) = 19.92, p F(1,14) = 0.00, p = .99, nor was there a significant cubic trend, F(1,14) = .37, p = .55. Figure 1. Average choice probability for nasal dominance filling-in as function of type of relative saturation (N = 15). Discussion Participants reported asymmetrical nasal dominance filling-in significantly more than symmetrical or temporally dominant filling-in. This replicated preliminary findings by Li et al., (2014), that filling-in from the nasal side occupied a much larger region than filling-in from the temporal side. A colour effect was revealed with a preference for green over red whilst controlling for salience, which Hamburger, Prior, Sarris and Spillmann, (2005) account for through higher-level processing of colour information. They postulate that typical background colours in natural scenes, i.e. green and blue, fill-in more easily than colours that are attributed to the foreground i.e. red and yellow. Hence in future studies, more colour pairings including blue and yellow should be tested to validate this theory. Yet, this colour effect may also reveal that relative salience was poorly controlled for in this study, as Brown and Thurmond (1993) manipulated saturation, reporting that a more salient colour is favoured when filling-in. This is because the green provided more contrast than the red as Hamburger et al., (2005) suggests that perceptual qualities of surfaces, e.g., saturation, affect other properties such as contrast and luminance. This raises concerns in the current study in the me asure of relative salience, as is it unclear whether changes in saturation alone prompted a global process that overruled the local processes involved in filling-in. Hence, in future studies these visual characteristics need to be carefully controlled for to ensure that it does not have a confounding effect on salience. As predicted, asymmetrical choice probability declined as the relative saturation for the nasal side decreased. This concurs with Li et al., (2014) that the strength of colour filling-in is determined by the retinotopic rule, whereby the direction of filling-in is correlated to greater cortical projection on the nasal side. Furthermore, Fahle and Schmid (1987) contend that the nasal side has a lower contrast sensitivity threshold compared to the temporal side which implies that the receptors on the nasal side were more easily able to detect a change in saturation, which increased the relative salience of the temporal side. This offered access to greater filling-in, which decreased the nasal-preference for asymmetrical filling-in of the disk. This can be extended for future research by also examining the effect of an increase in relative saturation e.g., 150%, 200%, 300% which may have an additive effect by strengthening the retinotopic rule (Brown Thurmond, 1993). However, contrary to the hypothesis that the asymmetrical choice probability would increase as relative saturation for the temporal side decreased, nasal dominant filling-in decreased as saturation decreased on the temporal side. As mentioned, the perceptual qualities of surfaces interact as Komatsu (2006) implies that the brain needs to integrate lower level visual information such as colour and brightness and decode it at the retinotopic map. This signal is then transmitted to higher cortical areas to eventually generate surface perception. Cortical processing in these early visual systems are heavily biased toward the detection of local contrast in luminance, resulting from edges, which is necessary in surface perception (De Weerd, 2006). In the present study when saturation was decreased on the temporal side, it also changed the luminance of the green colour, making it more salient relative to the red, amplifying the edge between the two colours. Hence, considering this local pro cessing preference for variations in luminance, Sakaguchi (2001) contended that the physical edge that exists in the annulus can activate the neurons coding them, as the two colours differ in luminance. This increased the salience of the temporal side, permitting a greater percentage of the temporal side of the disk to fill-in. Another limitation of the present study is that a majority of participants verbally reported seeing a black spot mainly on the temporal side, implying that the annulus did not fill-in completely. Yet as Li et al., (2014) argues that colour perception processes are rapid and preattentive, this incomplete filling-in cannot be attributed to an inadequate fixation time. Rather, this can be explained by other methodological issues as Spillmann et al., (2006) attribute this partial filling-in to improper fixation and involuntary eye movements that displace the annulus relative to the blind-spot. Spillmann et al., (2006) highlight the significance of this partial-filling in effect in validating that filling-in is an active physiological process generated by a narrow edge at the blind-spot. However as this dark shadow was reported mainly on the temporal side it can be explained by the more sparse distribution of receptors on the retinotopic map resulting in weaker temporal processes. As the width of the annuli remained constant, the nasal side filled in better due to a denser distribution of receptors (Li et al., 2014). Hence future studies should consider the relative width of the stimulus to suggest a width for the temporal side of the annulus in order to achieve symmetrical filling-in. In summation, this study presents evidence for active neural processes in retinotopically organized lower order areas, but also a role for higher order cognitive factors such as surface description (De Weerd, 2006). In the future, studies should attempt to map the size of the activated brain area to endorse this retinotopic asymmetry during filling-in and the effects of relative salience on this symmetry (Li et al., 2014).

Racial and Ethnic Discrimination in Canada Essay

â€Å"You know the world is off tilt when the best rapper is a white guy (Eminem), the best golfer is a black guy (Tiger Woods), the tallest basketball player is Chinese (Yao Ming, 7’6†³) and Germany doesn’t want to go to war (in Iraq)†. Charles Barkley stated in a 2003 interview, pointing out various misconceptions with stereotypes. A stereotype is defined by dictionary. com as: â€Å"something conforming to a fixed or general pattern; especially: an often oversimplified or biased mental picture held to characterize the typical individual of a group†. I have commonly heard stereotypes such as the French are good cooks, Italians are great lovers, and the Irish are lazy or comments made like dumb jock, lazy Cape Bretoner, or that women are not strong!! The list could go on endlessly as there appears to be stereotypes regarding people of all races, religions, sexes and ethnic groups, etcetera. Stereotypes can be either positive or negative. Most stereotypes tend to make us feel superior in some way to the person or group being stereotyped. Stereotypes ignore the uniqueness of individuals by painting all members of a group with the same brush. Throughout the course of this paper I plan to discuss some racial and ethnic issues in Canada. Where some of these issues originated from, what we can personally do to help eliminate discrimination in the workplace and what the government is doing to try to combat such discrimination. Let me first begin by defining discrimination, racism and ethnicity since these terms are all important terms to understand before going into further discussion. To discriminate is simply defined by yourdictionary. com as: â€Å"To make distinctions on the basis of class or category without regard to individual merit; show preference or prejudice. † Therefore, discrimination occurs when a person is not treated equally because of their gender, race, religion, ethnic origin, nationality, sexual orientation, or age. Yourdictionary. com defines racism as: â€Å"The belief that race accounts for differences in human character or ability and that a particular race is superior to others. Discrimination or prejudice based on race. † In other words, when an individual or group is treated unfairly or abused because of their skin color or racial heritage they are victims of racism. Ethnic, as defined by yourdictionary. com is: â€Å"Of or relating to a sizable group of people sharing a common and distinctive racial, national, religious, linguistic, or cultural heritage. B. Being a member of a particular ethnic group, especially belonging to a national group by heritage or culture but residing outside its national boundaries. † With that being said, it is my belief that stereotypes and ignorance about others most often lead to discriminatory behavior both inside and outside the workplace. I have heard Canada described as a multicultural nation meaning that Canadians are not of any one cultural background, race or heritage. For all Canadians, including Aboriginal People, this multicultural diversity can be traced to an immigrant past. This does not mean that the majority of today’s Canadians are immigrants but rather that the majority of Canadians have in their past, perhaps many generations ago, a family member who migrated here from another country. That is why many of us have a mixed ancestry, for example; Irish, Scottish, Ukrainian, French and Aboriginal, and the list can go on. Canada’s Aboriginal People were the first to immigrate, and settle across the continent, tens of thousands of years before European settlers. After the European settlers came the French, followed by the English, Scots and Irish formulating Canada into the diverse country it is today. In the years before the American Civil War, thousands of black slaves escaped slavery in the United States by following the â€Å"Underground Railway† north to Canada. Then, at the turn of the century, American farmers moved northward into the Canadian prairies to develop farm lands. Although Canada originally consisted of a wide variety of immigrants, some people were not as welcome in the country as others and were therefore not treated equally. Those who were of different race, color, or religion then the majority of Canadians were labeled as â€Å"foreigners†. The use of the term â€Å"foreigner† held many connotations for example, different, strange or inferior and many at the time wanted to see the â€Å"foreigners† assimilate to fit into Canadian society. There are many events in Canada’s past that has contributed to the racism and discrimination in Canada today for example, the disregard and unfair treatment of Aboriginal Peoples by European’s who settled here. Even though a vast majority of African-Americans moved to Canada to avoid slavery, from early in the 1600’s until 1834 there was a recorded 4092 slaves throughout the country, mostly living in Quebec . The Asiatic Exclusion League, which originated in California in 1905 as an anti-Oriental movement, moved north into Vancouver in 1907. The league was the main instigator in anti-Asian riots in the city since their main goal was to have all Chinese and Japanese immigrants removed from North America out of fear that they were taking jobs away from Whites . It also appears that throughout history the acceptance of immigrants in Canada greatly depended upon the economic state of the country at that time. During the Great Depression of the 1930’s immigrants seeking jobs were unwelcome and overlooked for employment. Although the Government of Canada has made many advances in breaking the barriers that Aboriginal People, immigrants and minorities face in the country; immigrants today still face a number of problems when trying to enter the labor market, for example: ? Non-recognition of international credentials and work experience ? Lack of Canadian work experience ?Inability to communicate in English or French ?Insufficient labor market information prior to immigrating to Canada I have traveled to some of the major cities in Canada and was a little surprised by the degree of segregation that is apparent in these cities. By this, I mean that these larger cities, like Toronto and Vancouver, have communities which are almost completely independent from the rest of the country. These independent communities that I saw, of Chinese or Italian people, seemed to have everything they needed to survive within the community including their own schools. I could not help but wonder what effect this type of segregation has on the country. I respect the fact that all people are trying to protect their identity. At the same time, by choosing to live in Canada, shouldn’t they try to integrate into the country a little more while still preserving their identities? Shouldn’t they try to assimilate? How can Canada thrive as a country with so much segregation? We need to become a unified country. Not such a historical thought pattern, I guess!! It is people who have attitudes like mine that are causing problems in the country or do all people have these thoughts and choose not to admit it. I have similar negative feelings about scholarships being available only to certain people or government funding for certain people to attend university because they are a minority. I understand that differential treatment is required in order for equality to become a possibility. However, I still feel a degree of resentment about these programs being offered when I have to borrow money in an effort to obtain my university degree. Will this resentment evolve? When I hold a management position in the future, will I discriminate against a person because he or she doesn’t have a huge student loan to pay and another does? It is cases like mine that causes racism to continue in society and the workplace today? With the announcement of Nova Scotia’s plan to increase immigration into the province came an increase in the racist comments I have heard. Since I work in bars I hear, and partake in, a great deal of conversation. When people are drinking they tend to be even more likely to say things they normally wouldn’t. That is why I have heard, at times, some very racist remarks. People have said that the government should be trying to retain people in the province that are born here before they bring â€Å"foreigners† here. They need to take care of their own first!! It is because of these comments and feelings that I am doubtful that discrimination against people, because of their race or color, will ever be completely eliminated in the country. How do we achieve equality with so much differentiation? How do we check or personal opinions at the door when we go to work? Since it is impossible to eliminate racism and discrimination entirely in society, we need to do as much as possible to eliminate it in the workplace. We need to make changes similar to the changes companies have made in an effort to combat discrimination against people because of their religion. For example, adapting zero tolerance rules, providing more education for employees, human resource departments need to provide more opportunities for people of minorities, immigrants, and Aboriginal Peoples and barriers have to be removed for all these people who are trying to enter our labor market. March 21, 2005 is International Day for Elimination of Racial Discrimination a day to remember the struggles and challenges that Aboriginal peoples and people of color have endured. It is also a time to recognize and applaud the fact that members of these two communities have made anti-racism struggles a significant part of labor’s agenda. Lets’ respect this day and try to make some positive changes at home, school, or work toward eliminating racism.

Assignment On Financial Market And Institutions Unit Code Bfc

ASSIGNMENT COVER SHEET Student’s name (Family name) Harmawan Kristanto (Given names) Jesselynn Cindy ID number 25208403 26210673 Phone 0435082309 0416740099 Unit name Financial market institutions Unit code BFC 2000 Title of assignment Assignment 1 Lecturer/tutor Andrew Sanford / Neeru Is this an authorised group assignment? 0 Yes 0 No If this submission is a group assignment, each student must attach their own signed cover sheet to the assignment. Has any part of this assignment been previously submitted as part of another unit/course? 0 Yes 0 No Tutorial/laboratory day time Monday 15.00 Due date 11 September 2015 Date submitted 11 September 2015 All work must be submitted by the due date. If an†¦show more content†¦Ã¢â‚¬ ¢ I understand the consequences of engaging in plagiarism and collusion as described in Part 7 of the Monash University (Council) Regulations. †¢ I have taken proper care of safeguarding this work and made all reasonable effort to ensure it could not be copied. †¢ I acknowledge that the assessor of this assignment may for the purposes of assessment, reproduce the assignment and: i. provide to another member of faculty; and/or ii. submit it to a plagiarism checking service; and/or iii. submit it to a plagiarism checking service which may then retain a copy of the assignment on its database for the purpose of future plagiarism checking. †¢ I certify that I have not plagiarised the work of others or participated in unauthorised collaboration when preparing this assignment. Signature Jesselynn Harmawan Cindy Kristanto Date 11 September 2015 Privacy Statement The information on this form is collected for the primary purpose of assessing your assignment. Other purposes of collection include recording your plagiarism and collusion declaration, attending to course and administrative matters and statistical analyses. If you choose not to complete all the questions on this form it may not be possible for Monash University to assess your assignment. You have a right to access personal information that Monash University holds about you, subject to any exceptions in relevant legislation.

A Comparison of the Functionalist View with the Marxist...

A Comparison of the Functionalist View with the Marxist View Sociologists may disagree in their interpretation of how society works. Some have focused on what keeps society together; others have focused on what divides society. Over the years the two major paradigms have dominated sociology these are functionalism and the conflict theory better know as Marxism. Both the Marxism view and the functionalist view have their own totally different point of view. Haralambos points out that ‘although functionalists emphasize the importance of value in society they do recognize that conflict can occur†. However functionalists consider such conflict as being the result of temporary disturbances in the†¦show more content†¦They believe that a social system is a functional unity whereby all the parts of the system work together. ‘Co-ordination and co-operation’. On the contrary Marxism could not be more strongly marked. Marxism stresses that the motive force for society and social change is conflict. Marx stresses that the links which bind sectors of society are economic and linked to the modes of production. Social conflict is created by the differing interests of competing social groupings, known as classes. A writer in the Marxist tradition would emphasize that the links between groupings within society are very weak and marked by very diverse interests of each particular group. Marxists argue that the functionalist view is an illusion- to think of modern society as one which is in a continuous state of harmony. On the contrary, every society is characterized by continuous conflict. There exists a struggle between the various groups and classes of society. The struggle for power, prestigue and economics goods gives rise to competition between the various sectors of society. Therefore, what we consider as society is the outcome of this continuous social conflict. 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