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Maestú F Saldaña C Amo C González-Hidalgo M Fernandez A Fernandez S Mata P Papanicolaou A Ortiz T 《Brain and language》2004,89(3):433-438
Shift of the cortical mechanisms of language from the usually dominant left to the non-dominant right hemisphere has been demonstrated in the presence of large brain lesions. Here, we report a similar phenomenon in a patient with a cavernoma over the anterolateral superior temporal gyrus associated with epilepsy. Language mapping was performed by two complementary procedures, magnetoencephalography, and electrocorticography. The maps, indicated right temporal lobe dominance for receptive language and left frontal lobe dominance for expressive language. These results indicate that a small lesion, associated with epilepsy, may produce selective shifting of receptive language mechanisms as large lesions have been known to produce. 相似文献
995.
Identity matching-to-sample has been difficult to demonstrate in rats, but most studies have used visual stimuli. There is evidence that rats can acquire complex forms of olfactory stimulus control, and the present study explored the possibility that identity matching might be facilitated in rats if olfactory stimuli were used. Four rats were trained on an identity match-to-sample procedure with odorants mixed in cups of sand as stimuli. Digging in the sample cup produced two comparison cups, and digging in the comparison cup that contained the same scent as the sample was reinforced. When criterion accuracy levels were reached, novel stimuli were added to the baseline training regimen. All 4 rats reached terminal performance of above 90% correct matching with more than 20 different baseline stimuli and matched novel stimulus combinations with above-chance accuracy; 3 of the 4 rats matched novel stimuli at levels significantly above chance. Accurate matching performance was demonstrated both with 2- and 3-comparison procedures. These results suggest that generalized matching-to-sample can be observed in rats when olfactory stimuli are used and, furthermore, that multiple-exemplar training may be important for its emergence. 相似文献
996.
In Experiment 1, 10 pigeons were exposed to a successive symbolic matching-to-sample procedure in which the sample was generated by the pigeons' own behavior. Each trial began with both response keys illuminated white, one being the "correct" key and the other the "incorrect" key. The pigeons had no way of discriminating which key was correct and which incorrect, since these roles were assigned on a random basis with the same probability of 0.5 for each key. A fixed ratio of five responses was required on the correct key. However, each time the pigeon pecked the incorrect key, the correct key response counter reset. Five consecutive pecks on the correct key was the only way to end this component, and switch off both key lights. Two seconds later, these same keys were illuminated again, one green and the other red (comparison stimuli). Now, if the correct white key had been on the left, a peck at one color produced food, and if the correct white key had been on the right, a peck at the other color produced food. When the pigeons had learned this discrimination, they were exposed to several symmetry tests (simultaneous presentations of both keys illuminated the same color-i.e., both red or both green), in order to interchange the sample with the comparison stimuli. In Experiment 2, the importance of requiring discrimination between the samples and between the comparisons was analyzed. In Experiment 3, we compared the results of Experiment 1 with a slightly different experiment, which resulted in discrimination of key position, an exteroceptive stimulus. The results showed that symmetry emerged only when different responses were used as samples. 相似文献
997.
Shimizu H 《Journal of the experimental analysis of behavior》2006,86(2):239-251
This study tested the notion that an equivalence relation may include a response when differential responses are paired with stimuli presented during training. Eight normal adults learned three kinds of computer mouse movements as differential response topographies (R1, R2, and R3). Next, in matching-to-sample training, one of the response topographies was used to select a comparison stimulus B (B1, B2, or B3) conditionally upon presentation of sample stimulus A (A1, A2, or A3), and to select stimulus D (D1, D2, or D3) conditionally upon presentation of stimulus C (C1, C2, or C3). After two sample-comparison-response relations (ABR and CDR) were established, 18 sample-comparison relations were tested (BA, DC, RA, RB, RC, RD, AC, CA, AD, DA, BC, CB, BD, DB, AA, BB, CC, and DD). In the RA, RB, RC, and RD tests, the differential responses (R1, R2, and R3) were used as sample stimuli. All subjects made class-consistent comparison selections in the tests. This study provides evidence that responses may become members of an equivalence class. 相似文献
998.
We describe a principled way of imposing a metric representing dissimilarities on any discrete set of stimuli (symbols, handwritings,
consumer products, X-ray films, etc.), given the probabilities with which they are discriminated from each other by a perceiving
system, such as an organism, person, group of experts, neuronal structure, technical device, or even an abstract computational
algorithm. In this procedure one does not have to assume that discrimination probabilities are monotonically related to distances,
or that the distances belong to a predefined class of metrics, such as Minkowski. Discrimination probabilities do not have
to be symmetric, the probability of discriminating an object from itself need not be a constant, and discrimination probabilities
are allowed to be 0’s and 1’s. The only requirement that has to be satisfied is Regular Minimality, a principle we consider the defining property of discrimination: for ordered stimulus pairs (a,b), b is least frequently discriminated from a if and only if a is least frequently discriminated from b. Regular Minimality generalizes one of the weak consequences of the assumption that discrimination probabilities are monotonically
related to distances: the probability of discriminating a from a should be less than that of discriminating a from any other object. This special form of Regular Minimality also underlies such traditional analyses of discrimination
probabilities as Multidimensional Scaling and Cluster Analysis.
This research was supported by the NSF grant SES 0318010 (E.D.), Humboldt Research Award (E.D.), Humboldt Foundation grant
DEU/1038348 (H.C. & E.D.), and DFG grant Co 94/5 (H.C.). 相似文献
999.
Xu F 《Cognition》2003,89(1):B15-B25
Two experiments investigated numerosity discrimination in 6-month-old infants, comparing their performance on both large numbers (4 vs. 8 elements) and small numbers (2 vs. 4 elements) with both total filled area and total contour length controlled for. These studies provide the first direct comparison between discrimination of small and large numbers in infants with the same methodology, the same type of stimuli, and the same continuous variable controls. Results showed that infants succeeded in discriminating 4 from 8 elements but failed to discriminate 2 from 4 elements, providing evidence for the existence of two systems of number representations in infancy. 相似文献
1000.
Delkeskamp-Hayes Corinna 《Christian Bioethics: Non-Ecumenical Studies in Medical Morality》2003,9(1):3-21
Hospital chaplaincy, in its exposure to clients, colleagues,and care-takers from different faith backgrounds, can be understoodin either generic or catholic terms. The first understanding,often merely implicit in denominationalist approaches, assumesthat some "Absolute" can be prayerfully invoked through themedium of diverse rituals, confessions, and symbols. This positioncombines the advantage of unprejudiced acceptance of other creedsand traditions with the disadvantage of lacking resources fordiscriminating among the spiritualities that may be operativewithin those other creeds and traditions. Catholicism, in linkingtrue spirituality with the one true church as the mystical bodyof the Tri-une God, secures such a criterion but fails to satisfythe tolerance-of-acknowledgement in the secular sense, whichis canonical in contemporary ecumenism. The Orthodox understandingof Catholicism is portrayed as imposing a non-judgemental humilityand repentance which provides a solution to that spiritual-humandilemma of inter-faith cooperation in the hospital. 相似文献