Perception of Overlapping and Embedded Figures by Children of Different Ages

Ghent, Lila

doi:10.2307/1419081

Cited by 163 publications

(48 citation statements)

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“…For example, evidence from EEG has shown that we are able to make rapid judgments about the presence of animals or non-animals in briefly presented Alternatively, it has been proposed that shape perception is mediated by recurrent, interactive, processing dependent upon cortico-cortico feedback loops during both early and higher-levels of vision (Bar, 2003;Beck & Palmer, 2002;Fenske, Aminoff, Gronau & Bar, 2006;Freeman, Driver, Sagi & Zhaoping, 2003;Harel, Ullman, Harari & Bentin, 2011;Humphreys, Riddoch & Price, 1997;Ito & Gilbert, 1999; Lewicki & Sejnowski, 1997;Luck, Chelazzi, Hillyard & Desimone, 1997;Moran & Desimone, 1985;Peterson & Gibson, 1994; Rao & Ballard, 1999;Rock, 1962; Rolls, 2008;Schiller, 1993 In the standard version of the task, patients are presented with arrays of overlapping line drawings (Ghent, 1956; Poppelreuter, 1917). Responses can be measured in several Overlapping figures and ventral simultanagnosia 5 ways, including by asking patients to name individual objects, or to select items from a response sheet containing non-overlapping stimuli (Bisiach, Capitani, Nichelli & Spinnler, 1976;De Renzi, Scotti & Spinnler, 1969; Della Sala, Laiacona, Trivelli & Spinnler, 1995).…”

Section: Word Count: 150mentioning

confidence: 99%

“…In the standard version of the task, patients are presented with arrays of overlapping line drawings (Ghent, 1956;Poppelreuter, 1917). Responses can be measured in several Overlapping figures and ventral simultanagnosia 5 ways, including by asking patients to name individual objects, or to select items from a response sheet containing non-overlapping stimuli (Bisiach, Capitani, Nichelli & Spinnler, 1976;De Renzi, Scotti & Spinnler, 1969;Della Sala, Laiacona, Trivelli & Spinnler, 1995).…”

Section: Overlapping Figures and Ventral Simultanagnosiamentioning

confidence: 99%

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Impaired integration of object knowledge and visual input in a case of ventral simultanagnosia with bilateral damage to area V4

Leek

d’Avossa

Tainturier

et al. 2012

Cognitive Neuropsychology

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In this study we report some of the first evidence showing how brain-damage can affect the underlying processes that support the integration of sensory input and prior knowledge during the visual perception of shape. We report the case of patient MT with an acquired ventral simultanagnosia following posterior occipito-temporal lesions encompassing V4 bilaterally. Despite showing normal object recognition for single items, and intact low-level vision, MT was impaired in object identification with overlapping figures displays. Task performance was modulated by familiarity: unlike controls, MT was faster with overlapping displays of abstract shapes than common objects. His performance with overlapping common object displays was also influenced by both the semantic relatedness and visual similarity of the display items.These findings challenge claims that visual perception is driven solely by feedforward mechanisms, and show how brain-damage can selectively impair high-level perceptual processes supporting the integration of stored knowledge and visual sensory input. Word Count: 150Key words: Ventral simultanagnosia, perceptual integration, overlapping figures, V4Overlapping figures and ventral simultanagnosia 3One of the fundamental issues in our understanding of human vision is the extent to which shape perception is driven solely by the rapid feedforward processing of sensory information, or is rather constrained by the integration of visual input with stored 'topdown' object knowledge. For example, evidence from EEG has shown that we are able to make rapid judgments about the presence of animals or non-animals in briefly presented Alternatively, it has been proposed that shape perception is mediated by recurrent, interactive, processing dependent upon cortico-cortico feedback loops during both early and higher-levels of vision (Bar, 2003;Beck & Palmer, 2002;Fenske, Aminoff, Gronau & Bar, 2006;Freeman, Driver, Sagi & Zhaoping, 2003;Harel, Ullman, Harari & Bentin, 2011;Humphreys, Riddoch & Price, 1997;Ito & Gilbert, 1999; Lewicki & Sejnowski, 1997;Luck, Chelazzi, Hillyard & Desimone, 1997;Moran & Desimone, 1985;Peterson & Gibson, 1994; Rao & Ballard, 1999;Rock, 1962; Rolls, 2008;Schiller, 1993 In the standard version of the task, patients are presented with arrays of overlapping line drawings (Ghent, 1956; Poppelreuter, 1917). Responses can be measured in several Overlapping figures and ventral simultanagnosia 5 ways, including by asking patients to name individual objects, or to select items from a response sheet containing non-overlapping stimuli (Bisiach, Capitani, Nichelli & Spinnler, 1976;De Renzi, Scotti & Spinnler, 1969; Della Sala, Laiacona, Trivelli & Spinnler, 1995).Successful performance requires accurate grouping and integration of image features belonging to different items occupying overlapping spatial locations. MT's performance was found to be strongly influenced by object familiarity: unlike controls, he did better with overlapping abstract shapes than with line drawings of familiar comm...

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Section: Word Count: 150mentioning

confidence: 99%

Section: Overlapping Figures and Ventral Simultanagnosiamentioning

confidence: 99%

Impaired integration of object knowledge and visual input in a case of ventral simultanagnosia with bilateral damage to area V4

Leek

d’Avossa

Tainturier

et al. 2012

Cognitive Neuropsychology

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“…23 Naming Lilia Ghent-embedded figures was used to evaluate visual-perceptual skills as a visual interference task. 24 According to the age-corrected norms, 100% of success (35/35 figures ) must be attained from 5 years of age.…”

Section: Treatmentmentioning

confidence: 99%

Neuropsychological outcome in long-term survivors of a childhood extracranial solid tumor who have undergone autologous bone marrow transplantation

Notteghem

Soler

Dellatolas

et al. 2003

Bone Marrow Transplant

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Summary:The purpose of this study was to evaluate neuropsychological and adaptive functioning of children who have undergone bone marrow transplantation (BMT) without previous cranial irradiation. In total, 76 children treated for an extracranial tumor with BMT without total body irradiation (TBI) were evaluated at least 5 years after the end of the treatment.Overall, their performance and skills were in the normal range and their professional and academic outcomes were satisfactory. Nevertheless, we observed a deleterious effect of deafness on verbal IQ associated with the previous administration of cisplatin during conventional chemotherapy. In addition, reading difficulties had arisen. This could be related to absence from kindergarten or primary school during hospitalization. Finally, in the younger subgroup, visual-perceptual skills were found to be more fragile.

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“…Calling the UNKRUNCH routine without first clearing highresolution graphics Page 2 will result in the recreated picture's being merged with the current image. Thus, for example, stimuli such as the overlapping figures used by Ghent (1956) may easily be created (see Figure 3). Simi- …”

Section: Overlaying Picturesmentioning

confidence: 99%

“…A significant effect of picturetype was evident [F(2,8) Thus, prior exposure to a particular picture not only increases the amount of noise subjects can tolerate for correct identification (as shown by the measure of percen- Figure 3. An example of overlapping pictures, producing stimuli similar to those used by Ghent (1956). tage clarified for correct identification), but also reduces the amount of study time required to identify the picture through the noise.…”

Section: Other Dependent Variablesmentioning

confidence: 99%