Search results for "Spatial"
showing 10 items of 2121 documents
Optogenetically blocking sharp wave ripple events in sleep does not interfere with the formation of stable spatial representation in the CA1 area of …
2016
During hippocampal sharp wave/ripple (SWR) events, previously occurring, sensory inputdriven neuronal firing patterns are replayed. Such replay is thought to be important for plasticity-related processes and consolidation of memory traces. It has previously been shown that the electrical stimulation-induced disruption of SWR events interferes with learning in rodents in different experimental paradigms. On the other hand, the cognitive map theory posits that the plastic changes of the firing of hippocampal place cells constitute the electrophysiological counterpart of the spatial learning, observable at the behavioral level. Therefore, we tested whether intact SWR events occurring during th…
Spatio-Chromatic Adaptation via Higher-Order Canonical Correlation Analysis of Natural Images
2014
Independent component and canonical correlation analysis are two general-purpose statistical methods with wide applicability. In neuroscience, independent component analysis of chromatic natural images explains the spatio-chromatic structure of primary cortical receptive fields in terms of properties of the visual environment. Canonical correlation analysis explains similarly chromatic adaptation to different illuminations. But, as we show in this paper, neither of the two methods generalizes well to explain both spatio-chromatic processing and adaptation at the same time. We propose a statistical method which combines the desirable properties of independent component and canonical correlat…
The problem of spatial homogeneity in an LCoS projector
2019
Abstract Video projectors allow interesting applications in vision sciences since they provide a large projection area. We have colorimetrically characterized a LCoS projector using a mathematical model requiring additivity and constancy of the primaries -a sigmoid function in our case. Significant differences in chromaticity in the CIELAB space, but not in lightness, were found between the center and the corners of the screen. The lack of spatial homogeneity led us to estimate the parameters of the model as a function of spatial position, using different strategies. The best result was obtained by interpolating the values of the parameters of the model determined from experimental measurem…
Rotation-invariant optical recognition of three-dimensional objects.
2008
An automatic method for rotation-invariant three-dimensional (3-D) object recognition is proposed. The method is based on the use of 3-D information contained in the deformed fringe pattern obtained when a grating is projected onto an object’s surface. The proposed method was optically implemented by means of a two-cycle joint transform correlator. The rotation invariance is achieved by means of encoding with the fringe pattern a single component of the circular-harmonic expansion derived from the target. Thus the method is invariant for rotations around the line of sight. The whole experimental setup can be constructed with simple equipment. Experimental results show the utility of the pro…
The role of literacy skills in adolescents' mathematics word problem performance – Controlling for visuo-spatial ability and mathematics anxiety
2014
Abstract The aim of the present study is to examine the relationship between eighth-grade adolescents' literacy skills and mathematics word problem performance. Moreover, visuo-spatial ability and mathematics anxiety were considered as covariates. According to the analyses of (co)variance, literacy skills were significantly associated with mathematics word problem skills among the 99 8th grade participants of the study. It is primarily for boys that reading comprehension skill predicts success in solving math word problems, while technical reading predicts both calculation skill and word problem solving skill across genders. Visuo-spatial ability was not a significant covariate in either of…
Tulkinnallinen horjuvuus ja affektit
2013
Ambiguous Meanings and Affects – Death in Monika Fagerholm’s The American Girl and The Glitter Scene The article focuses on the deaths that take place in Monika Fagerholm’s novels The American Girl (2005) and The Glitter Scene (2009). The viewpoint to the novels is that of affects. The theore¬tical framework derives from the French philosopher Gilles Deleuze (1925–1995) who is one of the best-known 20th century philosophers of affect. Firstly, the article discusses the ways in which the deaths affect the characters of the novels. Attention is paid especially to the central character called Doris Flinkenberg. She is strongly affected by the deaths that have taken place in the District where …
Dots, Lines, Areas and Words: Mapping Literature and Narration (With some Remarks on Kate Chopin’s “The Awakening”)
2009
The so-called spatial turn of the humanities has led to an increasing interest in mapmaking. Looking at various trends in map-making the paper evaluates possible links and cooperation between cartography and literary studies. Differentiating between two central questions - which features of literature may be considered as spatial and in what way literature as a social practice could become spatially relevant – the paper argues that maps of literature should be based on specific features that constitute a literary text as opposed to other forms of art and discourse. Claiming that maps of literature should provide more than a visualisation of structure or an illustration of certain forms or c…
Seasonal variation of air kerma rate in Sicily.
2007
Thermoluminescence dosimetry has been used to measure air kerma in 29 sites in Sicily. Four three month measurement campaigns have been carried out in order to assess seasonal variations. Average annual values between 20 and 90 nGy h(-1), after cosmic background subtraction, are reported. Average annual values are strongly dependent on site lithology, and we find that winter data are generally the highest, while spring and autumn rates are generally the lowest with very similar trends in any site. Summer values generally lay in between. Largest seasonal variations are found in sites along the southern coast of the island, probably because of stronger action of winds affecting radon, along w…
Stratégies d'influences et politiques de maîtrise de la croissance locale
2010
Over the last ten years, real estate prices have risen considerably and accordingly to most observers, this can at least partly be attributed to an insufficient supply, due to local growth control measures. This thesis tries to understand what motivates local authorities implementing such policies. Local politicians are considered as opportunistic and their decision is modelled as the result of a political struggle between different land-related interests. This game for influence mainly opposes the owners of developed and undeveloped land, who find allies amongst local business interests that might form growth or ideas machines. Our first model describes this struggle under different hypoth…
Local Tourism System in Sicily: a proposal for the identification through spatial classification with the constraints of contiguity
2012
The theoretical approach to Tourism Economics is based on the systemic nature of tourism, stemming both from the heterogeneity of the tourist package and from the existing complex interactions among destinations, firms, tourists. The systemic nature of tourism and the identification with its geographical representation, that is the destination, introduce the concept of Local Tourist System (LTS). This systemic nature has also been recognized by the Italian legislation by creating of an economic policy instrument, named Local Tourist System: “We call local tourist systems, homogeneous or integrated tourist environments, which include territories belonging even to different regions characteri…