Abstract：
:Visual agnosia is a neuropsychological syndrome characterized by a failure of object identification. Apperceptive agnosia, an object identification deficit caused by damage to early perceptual processes, has been explained by appealing to both damaged early sensory processes and to damaged preattentive grouping processes. Which of these two explanations best accounts for the behavior of these patients? We present results from two experiments designed to distinguish rival theoretical accounts of apperceptive agnosia. In our studies, we attempted to simulate apperceptive agnosia in neurologically intact subjects. Sensory-deficit accounts of the syndrome predict that degrading visual processing would make normal subjects perform like patients; grouping-deficit accounts predict that removing perceptual organization cues from visual displays would make normal subjects perform like patients. We were able to simulate the behavior of an apperceptive agnosic patient by removing perceptual organization cues, consistent with a grouping-deficit account of this syndrome. The implications for understanding both apperceptive agnosia and normal visual functioning are discussed.
journal_name
J Cogn Neuroscijournal_title
Journal of cognitive neuroscienceauthors
Vecera SP,Gilds KSdoi
10.1162/089892998562979subject
Has Abstractpub_date
1998-09-01 00:00:00pages
568-80issue
5eissn
0898-929Xissn
1530-8898journal_volume
10pub_type
杂志文章abstract：:Sound waves emitted by two or more simultaneous sources reach the ear as one complex waveform. Auditory scene analysis involves parsing a complex waveform into separate perceptual representations of the sound sources [Bregman, A. S. Auditory scene analysis: The perceptual organization of sounds. London: MIT Press, 199...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00764
更新日期：2015-05-01 00:00:00
abstract：:Lesion and neuroimaging studies suggest that orbito-frontal cortex (OFC) supports temporal aspects of episodic memory. However, it is unclear whether OFC contributes to the encoding and/or retrieval of temporal context and whether it is selective for temporal relative to nontemporal (spatial) context memory. We addres...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn.2009.21316
更新日期：2010-08-01 00:00:00
abstract：:Although previous research has demonstrated that individuals are motivated to self-enhance, the neurocognitive mechanisms and temporal dynamics of self-enhancement are poorly understood. The current research examined whether self-enhancing motivations affect the perceptual processing of social feedback. Participants w...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00645
更新日期：2014-10-01 00:00:00
abstract：:Prospective memory (PM) refers to the cognitive processes associated with remembering to perform an intended action after a delay. Varying the salience of PM cues while keeping the intended response constant, we investigated the extent to which participants relied on strategic monitoring, through sustained, top-down c...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_01604
更新日期：2020-10-01 00:00:00
abstract：:The putative independence of cortical mechanisms for color, form, and motion raises the binding problem-how is neural activity coordinated to create unified and correctly segmented percepts? Binding could be guided by stimulus-driven correlations between mechanisms, but the nature of these correlations is largely unex...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章,评审
doi：10.1162/0898929041502742
更新日期：2004-07-01 00:00:00
abstract：:Several behavioral and brain imaging studies have demonstrated a significant interaction between speech perception and speech production. In this study, auditory cortical responses to speech were examined during self-production and feedback alteration. Magnetic field recordings were obtained from both hemispheres in s...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/089892902760807140
更新日期：2002-11-15 00:00:00
abstract：:Prestimulus subsequent memory effects (preSMEs)-differences in neural activity elicited by a task cue at encoding that are predictive of later memory performance-are thought to reflect differential engagement of preparatory processes that benefit episodic memory encoding. We investigated age differences in preSMEs ind...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_01249
更新日期：2018-06-01 00:00:00
abstract：:Attentional control and working memory capacity are important cognitive abilities that substantially vary between individuals. Although much is known about how attentional control and working memory capacity relate to each other and to constructs like fluid intelligence, little is known about how trial-by-trial fluctu...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00811
更新日期：2015-08-01 00:00:00
abstract：:We used fMRI to study figure-ground representation and its decay in primary visual cortex (V1). Human observers viewed a motion-defined figure that gradually became camouflaged by a cluttered background after it stopped moving. V1 showed positive fMRI responses corresponding to the moving figure and negative fMRI resp...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00190
更新日期：2012-04-01 00:00:00
abstract：:Abstract Recent physiological experiments have shown that the responses of many neurons in V1 and V3a are modulated by the direction of gaze. We have developed a neural network model of the hierarchy of maps in visual cortex to explore the hypothesis that visual features are encoded in egocentric (spatio-topic) coordi...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn.1993.5.2.150
更新日期：1993-04-01 00:00:00
abstract：:Neural network models were examined during delayed matching-to-sample tasks (DMS), and neurons in a monkey's prefrontal cortex were studied during the performance of comparable tasks. In DMS, various input stimuli follow a sample stimulus, and an output should occur whenever the sample reappears. Our previous models h...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/089892900562255
更新日期：2000-05-01 00:00:00
abstract：:Perceptual learning is sometimes characterized by rapid improvements in performance within the first hour of training (fast perceptual learning), which may be accompanied by changes in sensory and/or response pathways. Here, we report rapid physiological changes in the human auditory system that coincide with learning...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn.2009.21279
更新日期：2010-02-01 00:00:00
abstract：:Prosopagnosic patients appear to be impaired at recognizing faces. However, recent evidence for "covert recognition" in prosopagnosia has been taken to suggest that the impairment is not in face recognition per se, but rather in conscious access to face recognition. The most widely used test for covert recognition of ...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn.1992.4.2.150
更新日期：1992-04-01 00:00:00
abstract：:We claim that the animate and inanimate conceptual categories represent evolutionarily adapted domain-specific knowledge systems that are subserved by distinct neural mechanisms, thereby allowing for their selective impairment in conditions of brain damage. On this view, (some of) the category-specific deficits that h...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章,评审
doi：10.1162/089892998563752
更新日期：1998-01-01 00:00:00
abstract：:The current study used quantitative electroencephalography (qEEG) to characterize individual differences in neural rhythms at rest and to relate them to fluid reasoning ability, to first language proficiency, and to subsequent second language (L2) learning ability, with the goal of obtaining a better understanding of ...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_01337
更新日期：2019-01-01 00:00:00
abstract：:Decision-making algorithms face a basic tradeoff between accuracy and effort (i.e., computational demands). It is widely agreed that humans can choose between multiple decision-making processes that embody different solutions to this tradeoff: Some are computationally cheap but inaccurate, whereas others are computati...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_01263
更新日期：2018-10-01 00:00:00
abstract：:It has been proposed that at least two distinct processes are engaged during task-switching: reconfiguration of the currently relevant task-set and interference resolution arising from the competing task-set. Whereas in healthy individuals the two are difficult to disentangle, their disruption is thought to cause diff...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_01674
更新日期：2021-01-21 00:00:00
abstract：:Numerous studies have documented that older adults (OAs) do not perform as well as young adults (YAs) when task demands require the establishment or retrieval of a novel link between previously unrelated information (relational memory: RM). Nonetheless, the source of this age-related RM deficit remains unspecified. On...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00058
更新日期：2011-11-01 00:00:00
abstract：:The fusion of rhythm, beat perception, and movement is often summarized under the term "entrainment" and becomes obvious when we effortlessly tap our feet or snap our fingers to the pulse of music. Entrainment to music involves a large network of brain structures, and neural oscillations at beat-related frequencies ca...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_01013
更新日期：2016-12-01 00:00:00
abstract：:Recent studies have shown that (1) the global precedence effects in processing the hierarchically organized stimulus can be attenuated by eliminating the low spatial frequencies contained in the stimulus and (2) the human magnocellular pathway is responsible for processing low spatial frequencies and the pathway can b...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/089892999563201
更新日期：1999-01-01 00:00:00
abstract：:We explored age-related differences in executive function during selection of a target from among active representations. Refreshing (thinking briefly of a just-activated representation) is an executive process that foregrounds a target relative to other active representations. In a behavioral study, participants saw ...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn.2008.20508
更新日期：2008-05-01 00:00:00
abstract：:Rhythmicity is a fundamental property of neural activity at multiple spatiotemporal scales, and associated oscillations represent a critical mechanism for communication and transmission of information across brain regions. During development, these oscillations evolve dynamically as a function of neural maturation and...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章,随机对照试验
doi：10.1162/jocn_a_00877
更新日期：2015-12-01 00:00:00
abstract：:When we respond to a stimulus, our decisions are based not only on external stimuli but also on our ongoing performance. If the response deviates from our goals, monitoring and decision-making brain areas interact so that future behavior may change. By taking advantage of natural variation in error salience, as measur...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00962
更新日期：2016-08-01 00:00:00
abstract：:Visual context plays a prominent role in everyday perception. Contextual information can facilitate recognition of objects within scenes by providing predictions about objects that are most likely to appear in a specific setting, along with the locations that are most likely to contain objects in the scene. Is such id...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn.2008.20027
更新日期：2008-03-01 00:00:00
abstract：:To understand the meanings of words and objects, we need to have knowledge about these items themselves plus executive mechanisms that compute and manipulate semantic information in a task-appropriate way. The neural basis for semantic control remains controversial. Neuroimaging studies have focused on the role of the...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00123
更新日期：2012-01-01 00:00:00
abstract：:Dopamine (DA) has been implicated in modulating multiple cognitive control processes, including the robust maintenance of task sets and memoranda in the face of distractors (cognitive stability) and, conversely, the ability to switch task sets or update the contents of working memory when it is advantageous to do so (...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_01518
更新日期：2020-05-01 00:00:00
abstract：:Humans with seven or more repeats in exon III of the DRD4 gene (long DRD4 carriers) sometimes demonstrate impaired attention, as seen in attention-deficit hyperactivity disorder, and at other times demonstrate heightened attention, as seen in addictive behavior. Although the clinical effects of DRD4 are the focus of m...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00724
更新日期：2015-03-01 00:00:00
abstract：:Individuals with primary progressive aphasia (PPA) show selective breakdown in regions within the proposed dorsal (articulatory-phonological) and ventral (lexical-semantic) pathways involved in language processing. Phonological STM impairment, which has been attributed to selective damage to dorsal pathway structures,...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn_a_00901
更新日期：2016-02-01 00:00:00
abstract：:Implicit motor learning tasks typically involve comparisons of subject responses during a sequence versus a random condition. In neuroimaging, brain regions that are correlated with a sequence are described, but the temporal relationship of sequence versus nonsequence conditions is often not explored. We present a fun...
journal_title：Journal of cognitive neuroscience
pub_type： 临床试验,杂志文章
doi：10.1162/089892901753165881
更新日期：2001-10-01 00:00:00
abstract：:Studies examining medial temporal lobe (MTL) involvement in memory formation typically assess memory performance after a single, short delay. Thus, the relationship between MTL encoding activity and memory durability over time remains poorly characterized. To explore this relationship, we scanned participants using hi...
journal_title：Journal of cognitive neuroscience
pub_type： 杂志文章
doi：10.1162/jocn.2009.21381
更新日期：2010-11-01 00:00:00
