scholarly journals Display Configuration and Duration Effects in Redundancy Gain for a Categorization Task

2017 ◽  
Vol 17 (10) ◽  
pp. 962 ◽  
Author(s):  
Ada Mishler ◽  
Mark Neider
Keyword(s):  
Redundancy Gain ◽  
Categorization Task ◽  
Display Configuration

The neural correlates of concreteness and ambiguity in a semantic categorization task

2006 ◽  
Author(s):  
Penny M. Pexman ◽  
Jodi D. Edwards ◽  
Ian S. Hargreaves ◽  
Luke C. Henry ◽  
Bradley Goodyear
Keyword(s):  
Neural Correlates ◽  
Categorization Task ◽  
Semantic Categorization

The effect of orthographic and emotional neighbourhood in a colour categorization task

2015 ◽  
Vol 17 (1) ◽  
pp. 115-122 ◽  
Author(s):  
Anna-Malika Camblats ◽  
Stéphanie Mathey
Keyword(s):  
Categorization Task

Dissociated expressive and receptive language functions on magnetoencephalography, functional magnetic resonance imaging, and amobarbital studies

2006 ◽  
Vol 104 (4) ◽  
pp. 598-607 ◽  
Author(s):  
Kyousuke Kamada ◽  
Fumiya Takeuchi ◽  
Shinya Kuriki ◽  
Tomoki Todo ◽  
Akio Morita ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Left Hemisphere ◽  
Receptive Language ◽  
Control Group ◽  
Low Grade ◽  
Temporal Region ◽  
Functional Magnetic Resonance ◽  
Categorization Task ◽  
Language Functions ◽  
Verb Generation

✓Dissociated language functions are largely invalidated by standard techniques such as the amobarbital test and cortical stimulation. Language studies in which magnetoencephalography (MEG) and functional magnetic resonance (fMR) imaging are used to record data while the patient performs lexicosemantic tasks have enabled researchers to perform independent brain mapping for temporal and frontal language functions (MEG is used for temporal and fMR imaging for frontal functions). In this case report, the authors describe a right-handed patient in whom a right-sided insular glioma was diagnosed. The patient had a right-lateralized receptive language area, but expressive language function was identified in the left hemisphere on fMR imaging–and MEG-based mapping. Examinations were performed in 20 right-handed patients with low-grade gliomas (control group) for careful comparison with and interpretation of this patient’s results. In these tests, all patients were asked to generate verbs related to acoustically presented nouns (verb generation) for fMR imaging, and to categorize as abstract or concrete a set of visually presented words consisting of three Japanese letters for fMR imaging and MEG. The most prominent display of fMR imaging activation by the verb-generation task was observed in the left inferior and middle frontal gyri in all participants, including the patient presented here. Estimated dipoles identified with the abstract/concrete categorization task were concentrated in the superior temporal and supramarginal gyri in the left hemisphere in all control patients. In this patient, however, the right superior temporal region demonstrated significantly stronger activations on MEG and fMR imaging with the abstract/concrete categorization task. Suspected dissociation of the language functions was successfully mapped with these two imaging modalities and was validated by the modified amobarbital test and the postoperative neurological status. The authors describe detailed functional profiles obtained in this patient and review the cases of four previously described patients in whom dissociated language functions were found.

Visual Categorization and Object Representation in Monkeys and Humans

2002 ◽  
Vol 14 (2) ◽  
pp. 187-198 ◽  
Author(s):  
N. Sigala ◽  
F. Gabbiani ◽  
N. K. Logothetis
Keyword(s):  
Object Representation ◽  
Rating Task ◽  
Linear Boundary ◽  
Conditional Probabilities ◽  
Diagnostic Features ◽  
Categorization Task ◽  
Visual Categorization ◽  
Perceptual Features ◽  
Subordinate Categorization

We investigated the influence of a categorization task on the extraction and representation of perceptual features in humans and monkeys. The use of parameterized stimuli (schematic faces and fish) with fixed diagnostic features in combination with a similarity-rating task allowed us to demonstrate perceptual sensitization to the diagnostic dimensions of the categorization task for the monkeys. Moreover, our results reveal important similarities between human and monkey visual subordinate categorization strategies. Neither the humans nor the monkeys compared the new stimuli to class prototypes or based their decisions on conditional probabilities along stimulus dimensions. Instead, they classified each object according to its similarity to familiar members of the alternative categories, or with respect to its position to a linear boundary between the learned categories.

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