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This experiment investigated age differences in electrophysiological correlates of retrieval success in a word-stem cued recall task. Young adults (M+/-SD: 21.4 years+/-1.9) performed this memory task more accurately than older participants (M+/-SD: 65.1 years+/-3.3). Robust event-related brain potential (ERP) old/new effects were identified in both age(More)
The IRIM group is a consortium of French teams working on Multimedia Indexing and Retrieval. This paper describes our participation to the TRECVID 2010 semantic indexing and instance search tasks. For the semantic indexing task, we evaluated a number of different descriptors and tried different fusion strategies, in particular hierarchical fusion. The best(More)
Typical simple reaction-time (RT) paradigms usually include a warning signal followed by a variable foreperiod before the presentation of a reaction stimulus. Most current interpretations suggest that the warning stimulus alerts the organism and so results in faster processing of either the sensory or motor components of the task. In this study,(More)
The widely used Pavlovian fear-conditioning paradigms used for studying the neurobiology of learning and memory have mainly used auditory cues as conditioned stimuli (CS). The present work assessed the neural network involved in olfactory fear conditioning, using olfactory bulb stimulation-induced field potential signal (EFP) as a marker of plasticity in(More)
In this paper, we present the first participation of a consortium of French laboratories, IRIM, to the TRECVID 2008 BBC Rushes Summarization task. Our approach resorts to video skimming. We propose two methods to reduce redundancy, as rushes include several takes of scenes. We also take into account low and mid-level semantic features in an ad-hoc fusion(More)
OBJECTIVE Warning signals can induce a paradoxical increase in reaction time (RT) when detecting targets. Top-down inhibitory control intended to prevent undesired responses to non-target stimuli may account for this effect. This hypothesis assumes the existence of a gating mechanism during conditions of uncertainty that locks the initiation of movement(More)
Ocular torsion is a key problem in the understanding of many visual perceptual effects. However, since it is difficult to record, its integration with other sensorimotor signals is still poorly understood. Unfortunately, eyetracker systems are generally not dedicated to the monitoring of eye torsion. In addition, the classical methods used with video-based(More)
This paper presents a spatio-temporal saliency model that predicts eye movements. This biologically inspired model separated a video frame into two signals corresponding to the two main outputs of the retina (parvocellular and magnocellular outputs). Both signals are then decomposed into elementary feature maps by cortical-like filters. These feature maps(More)
This paper presents an analysis of sound effect on visual gaze when looking at videos to help to predict eye positions. First, an audiovisual experiment was designed with two groups of participants, with audiovisual (AV) and visual (V) conditions to test the sound effect. We classify the sound in three classes: on-screen speech, non-speech and non-sound. We(More)