By Aleksandr Chuklin, Pavel Serdyukov, Maarten de Rijke (auth.), Pavel Serdyukov, Pavel Braslavski, Sergei O. Kuznetsov, Jaap Kamps, Stefan Rüger, Eugene Agichtein, Ilya Segalovich, Emine Yilmaz (eds.)
This e-book constitutes the complaints of the thirty fifth ecu convention on IR examine, ECIR 2013, held in Moscow, Russia, in March 2013. The fifty five complete papers, 38 poster papers and 10 demonstrations awarded during this quantity have been conscientiously reviewed and chosen from 287 submissions. The papers are prepared within the following topical sections: person features; multimedia and cross-media IR; information mining; IR concept and formal versions; IR process architectures; category; net; occasion detection; temporal IR, and microblog seek. additionally incorporated are four educational and a couple of workshop presentations.
Read or Download Advances in Information Retrieval: 35th European Conference on IR Research, ECIR 2013, Moscow, Russia, March 24-27, 2013. Proceedings PDF
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Additional resources for Advances in Information Retrieval: 35th European Conference on IR Research, ECIR 2013, Moscow, Russia, March 24-27, 2013. Proceedings
The association between the two buttons being relevant or non-relevant was changed for each participant. Prior to each image, a ﬁxation image was presented for two seconds and then the actual 20 Y. Moshfeghi et al. image was presented for four seconds. The ﬁxation image contained a ﬁxation cross, indicating to participants that they needed to ﬁxate on the cross and prepare for the next stimuli. Between each image block an eight second interval was used to reduce the eﬀect of the brain activities of one block being extended to the subsequent block.
The design of the fMRI study itself may also alter the task context. For instance, the study employs a basic fMRI block-design that has proven useful in the detection of small diﬀerences in the BOLD signals between contrasting events . However, one drawback of the block-design is that it is hard to ensure the average response to a trial-type is not biased by a speciﬁc context or history of preceding types . To a certain extent, the block-design limits the order in which stimulus is presented, therefore, constraining complete randomisation of the presented items.
General Linear Model (GLM) Analysis. Analysis began with a ﬁrst-level analysis on the data of individual participants using multiple linear regression of the BOLD-response time course in each voxel, using two predictors (Display Type: Relevant, Non-relevant). To achieve this, for each participant’s data a BrainVoyager protocol ﬁle (PRT) was derived that represented the onset and duration of the events for the diﬀerent conditions. Predictors’ time courses were adjusted for the hemodynamic response delay by convolution with a hemodynamic response function.