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Frdric Chauveau Christophe Pirard Christophe Tronche Mathieu Coutan Isabelle Drouet Pierrette Liscia Daniel Bracocha 《Neurobiology of learning and memory》2009,91(4):447-455
We previously showed that 24 h after learning, mice significantly remembered the first (D1) but not the second (D2) discrimination in a serial spatial task and that an acute stress delivered 5 min before the test phase reversed this memory retrieval pattern.A first experiment evaluated the effects of dorsal hippocampus (HPC) or prefrontal cortex (PFC) lesions, these two brain areas being well-known for their involvement in serial and spatial memory processes. For this purpose, six independent groups of mice were used: non-lesioned (controls), PFC or HPC-lesioned animals, submitted or not to an acute stress (electric footshocks; 0.9 mA). Results show that (i) non-stressed controls as well as PFC-lesioned mice (stressed or not) remembered D1 but not D2; (ii) stressed controls and HPC-lesioned mice (stressed or not) remembered D2 but not D1; (iii) stress significantly increased plasma corticosterone in controls and PFC-lesioned mice, but not in HPC-lesioned mice which already showed a significant plasma corticosterone increase in non-stressed condition.Since data from this first experiment showed that stress inhibited the hippocampal-dependent D1 memory retrieval, a second experiment evaluated the behavioral effect of intrahippocampal corticosterone injection in non-stressed mice. Results show that intrahippocampal corticosterone injection induced a reversal of serial memory retrieval pattern similar to that induced by acute stress.Overall, our study shows that (i) in non-stress condition, the emergence of D1 is HPC-dependent; (ii) in stress condition, the emergence of D2 requires the PFC integrity; moreover, intrahippocampal corticosterone injection mimicked the effects of stress in the CSD task. 相似文献
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Rosalie Perron Christine Lefebvre Nicolas Robitaille Benoit Brisson Frédéric Gosselin Martin Arguin Pierre Jolicœur 《Psychological research》2009,73(2):222-232
Observers encoded the spatial arrangement of two or three horizontal line segments relative to a square frame presented for
150 ms either in left or right visual field and either above or below the horizontal midline. The target pattern was selected
on the basis of colour (red vs. green) from an equivalent distractor pattern in the opposite left–right visual hemifield.
After a retention interval of 450 or 650 ms a test pattern was presented at fixation. The task was to decide whether the test
was the same as the encoded pattern or different. Selection of the to-be-memorised pattern produced an N2pc response that
was not influenced by the number of line segments nor by the length of the retention interval, but that was smaller in amplitude
for patterns presented in the upper visual field compared with patterns presented in the lower visual field. A sustained posterior
contralateral negativity (SPCN) followed the N2pc. The SPCN was larger for patterns with three line segments than for two,
was larger for patterns encoded from lower visual field than from upper visual field, and returned to baseline sooner for
the shorter retention interval than for the longer interval. These results, and others, provide an interesting and complex
pattern of similarities and differences between the N2pc and SPCN, consistent with the view that N2pc reflects mechanisms
of attentional selection whereas the SPCN reflects maintenance in visual short-term memory. 相似文献
86.
In the introduction to this special issue, we discuss the development of Wittgenstein's thought, distinguish what we take to be well-travelled versus less well-travelled aspects of his philosophy of psychological phenomena and summarize the diverse contributions to this collection. In order to do so, we briefly discuss the extent to which his writings themselves can properly serve as a basis for psychological theory and method. 相似文献
87.
The phenylpiperazine fluprazine hydrochloride was used to test the hypothesis that maternal aggression in laboratory mice reflects offensive motivation. Lactating females (n = 8 per condition) tested for aggression following drug treatment (1.0 mg/kg and 5.0 mg/kg of fluprasine) were significantly less aggressive than saline controls according to all measures used. The findings support the hypothesis that maternal aggression is offensive in nature, and provide no evidence that maternal attack is a mixture of offensive and defensive tendencies. 相似文献
88.
Maltais Christine Bouffard Thérèse Vezeau Carole Dussault Frédéric 《Social Psychology of Education》2021,24(4):1003-1024
Social Psychology of Education - The nature of the links between students’ motivation and their perception of parental concern about school performance is still controversial, and whether... 相似文献
89.
Declines in the ability to process context information may represent a fundamental mechanism of age-related cognitive changes. Two components of context processing--activation/updating and maintenance--were examined in a sample of healthy younger and older adults, along with individuals suffering from early stage dementia of the Alzheimer's type (DAT). All older adult groups showed context activation/updating impairments, whereas context maintenance was only impaired in the oldest adults (age>75 years) and was further exacerbated in DAT individuals. The results suggest that context processing may be composed of functionally dissociable components and point to the utility of this construct in understanding the timecourse of cognitive decline in healthy and pathological aging. 相似文献
90.
We studied the processing of two word strings in French made up of a determiner and a noun which contains a schwa (mute e). Depending on the noun, schwa deletion is present ("la tir'lire"), optional ("le ch(e)min") or absent ("la cornemuse"). In a production study, we show that schwa deletion, and the category of the noun, have a large impact on the duration of the strings. We take this into account in two perception studies, which use word repetition and lexical decision, and which show that words in which the schwa has been deleted usually take longer to recognize than words that retain the schwa, but that this depends also on the category of the word. We explain these results by examining the influence of orthography. Based on the model proposed by Grainger and Ferrand (1996), which integrates the written dimension, we suggest that two sources of information, phonological and orthographic, interact during spoken word recognition. 相似文献