Visual Object Agnosia And Prosopagnosia

Visual agnosia refers to the “…inability to recognize objects that results neither from general intellectual loss nor from a loss of basic sensory abilities,” (Anderson, 2009, p. 32). There are generally two types of visual agnosia: apperceptive agnosia and associative agnosia. Apperceptive agnosia is the inability to recognize or draw simple shapes as they are shown or represented. Associative agnosia is the ability to recognize and copy drawings of simple and complex shapes. However, person with associative agnosia are unable to recognize the complex objects (Anderson, 2009).

Throughout history, a human being was always reliant on the primary sensory areas. An ability to communicate and contract languages is considered to be a unique ability of human nation as no other species show an equal amount of complexity in terms of the structure and sound combination. On the other hand, primary visual cortex provides a skill set in order to identify the objects presented in the world, the distance towards them as well as to design a set of actions in order to incorporate some items such as a stone or a pen. The understanding of these systems is crucial, especially for those who suffer from strokes and tumors and as a result lost the ability to visually recognize objects or hear other people. This work will focus of the structure

Gibson’s and Gregory’s theories of perception both suggest that eye-retina is important for perception. The both believe that without eye-retina, a person will not be able to see. This is a common view of both of the theories of perception. The idea is supported by the case of SB. SB was a man who had been blind from birth due to cataracts. When he was 52, he had an operation which restored his sight and hence he could see. Thus, this case has shown the importance of eye-retina for things to be perceived. And therefore, supports both of theories of perception which eye-retina is essential for perception.

Vision and the act of looking is an important and recurring theme in many horror films. In early gothic literature, such as in Guy de Maupassant 's Le Horla, the author presents vision as definitive and universal proof and stresses the importance of seeing as well as the act of showing gore. As a society, we are routinely told ‘seeing is believing ' in the wake of any paranormal or supernatural phenomena, placing weight on the tangible. However, as science and technology have progressed the faithfulness of visual representation is increasingly throw into question, which in turn has led to societal anxiety. A few years earlier, video footage of an event rarely had its validity questions, whereas now it is easy

Prosopagnosia, also called face blindness, is a neuropsychological condition that refers to impairment in the recognition of faces. Although prosopagnosic patients suffer from other types of recognition impairments (place recognition, car recognition, facial expression of emotion, est.), they experience face recognition problems above or over other types impairments. Prosopagnosia occurs without intellectual, sensory or cognitive impairments; in other words, people with prosopagnosia can still recognize people from non-facial cues. They cannot recognize familiar people by their faces alone, and often use alternative routes to alleviate the effects of this impairment. These routes include

According to research, the earliest experimental change blindness is developed from the phenomena such as eye movements and more on working memory. It depends on the personal attention to the images they perceive (MacWhinney, 2001). Although individual have well informed and good memory on whether or not they have perceived an image, they also have poor recalling ability especially on the smaller details that are presented in that image. This is evidently through presentation of the complex pictures that are stimulated

In Oliver Sacks’ The Man Who Mistook His Wife for a Hat, he denotes a “deficit is an impairment or incapacity of neurological function; such as loss of speech, loss of language, loss of memory, loss of vision loss of dexterity, or loss of identity” (Sacks, 1985). The specific neurological disorder that is highlighted in chapter one is Visual Agnosia, which is a deficit associated with poor primary visual processing that affects shape perception, figures, object, face and letter recognition (Serino, et al., 2014). Other subtypes of visual agnosia that also seemed to fit the descriptions that Sacks shared is prosopagnosia, which is the inability to recognize human faces (Shah, 2016), and pantomime agnosia, characterized as the inability to understand gestures (Gonzalez, Mack, & Heilman, K., 1986).

Humans have a unique and wonderful device in how one sees. The eye and brain work together to turn the world into visual data one’s brain can understand and use. There are some eye conditions that inhibit the sight or the recognition of the shapes one sees. Research continues to overcome these conditions as well as to further understand the biochemical reaction that gives humans the sight and understanding one has of visual data. Included in the paper are some of the latest research methods.

General visual agnosia is important to study because of how drastically it could change someone’s life. The example of the writer with alexia who lost the ability to process letters was particularly striking because his career relied on that ability. The concentration of a “visual center” for the processing of written languages and the fact that it can be temporarily affected are important in understanding other

Moreover, Bruce and Young (1986) suggested that the name generation component can be accessed only via the appropriate person identity node. Thus, assuming that no brain-damaged patients can put names to face without knowing anything else about the person, however several patients showed the opposite pattern. For instance, Flude et al. (1989) reported that patient, EST, demonstrated greater retrieval of the occupations of familiar people when presented with their faces than when recalling their names. Such studies show that the processing of familiar faces differs from that of unfamiliar ones, because only relevant stored knowledge (e.g., name or occupation) with familiar faces is accessible.

Prosopagnosia is defined as the difficulty in recognizing an individuals face; it is broken down into 3 main types; Apperceptive prosopagnosia, associative prosopagnosia and developmental prosopagnosia. Perception is an important aspect when recognizing faces, without recognizing the stimulus (face) you would not be able to identify a person. Therefore the individuals who sufferer from this disorder is unable to accurately recognize a face whether that be the face of a familiar person such as a family member or close friend, the face of a famous person, or even their own face. This paper will look at prosopagnosia in greater detail, it will explain the 3 main types, as well as give insight as to why face recognition is important in our

Agnosia is a loss of ability to recognize objects, persons, sounds, shapes, or smells. The specific sense is not defective nor is there any significant memory loss. It is usually associated with a brain injury or neurological illness.

reduces the values of peaks, and the relative variance of peaks is stable. Under normal

Our brain receives input that is processed by the visual system in order to create perception. This is referred to as bottom up processing, as the information travels through a hierarchy of structures ranging from early cortical areas to higher functioning systems (Oram and Perret, 1994). In contrast, our brain often makes inferences about what we perceive, as a function of top down processing (Cauller, 1995). In the case of the hollow face illusion, our brain knows what we are observing is a face, and that faces are typically associated with convex objects (Gregory, 1973). Georgeson (1979) supports this idea by suggesting that the familiarity of an object has the ability to interfere with how it is

Similarly, both theories are supported by research. Lawson and Humphreys (1996), for example, showed that recognition is affected more by tilt of major axis (foreshortening) than any other rotation, which endorses Marr’s and Nishihara prediction that establishing a central axis is crucial to the process of recognition. Warrington and Taylor (1978) reported that brain damaged patients could recognize objects presented in a typical view only. These patients found difficult to say if two photographs presented simultaneously were the same object when one image was a typical view and the other an unusual view. Although this could be explained as the patient’s inability to transform a 2D version of the atypical view into a 3D model, it could also be due to difficulty in establishing the central axis or due to some features of the object being hidden. In a later study, Humphreys and Riddoch (1984) used images where either the axis had been foreshortened through rotation or a critical feature was hidden. They found that patients had more problems recognizing the images with a foreshortened axis than the ones where a critical feature was hidden. Their