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Recent research [Parkhurst, D., Law, K., & Niebur, E., 2002. Modeling the role of salience in the allocation of overt visual attention. Vision Research 42 (1) (2002) 107-123] showed that a model of bottom-up visual attention can account in part for the spatial locations fixated by humans while free-viewing complex natural and artificial scenes. That study(More)
What do we see when we glance at a natural scene and how does it change as the glance becomes longer? We asked naive subjects to report in a free-form format what they saw when looking at briefly presented real-life photographs. Our subjects received no specific information as to the content of each stimulus. Thus, our paradigm differs from previous studies(More)
Contralateral hemispheric representation of sensory inputs (the right visual hemifield in the left hemisphere and vice versa) is a fundamental feature of primate sensorimotor organization, in particular the visuomotor system. However, many higher-order cognitive functions in humans show an asymmetric hemispheric lateralization--e.g., right brain(More)
For optimal response selection, the consequences associated with behavioral success or failure must be appraised. To determine how monetary consequences influence the neural representations of motor preparation, human brain activity was scanned with fMRI while subjects performed a complex spatial visuomotor task. At the beginning of each trial, reward(More)
In this time-resolved functional magnetic resonance imaging (fMRI) study, we aimed to trace the neuronal correlates of covert planning processes that precede visually guided motor behavior. Specifically, we asked whether human posterior parietal cortex has prospective planning activity that can be distinguished from activity related to retrospective visual(More)
Object and scene recognition is one of the most essential functionalities of human vision. It is also of fundamental importance for machines to be able to learn and recognize meaningful objects and scenes. In this thesis, we explore the following four aspects of object and scene recognition. It is well known that humans can be “blind” even to major aspects(More)
Verbal working memory (vWM) involves storing and manipulating information in phonological sensory input. An influential theory of vWM proposes that manipulation is carried out by a central executive while storage is performed by two interacting systems: a phonological input buffer that captures sound-based information and an articulatory rehearsal system(More)
Reward is a powerful modulator of behavior. Animals and humans are endowed with the ability to learn to associate events and actions with reinforcing stimuli, and exibly adapt their behavior. The experiments described in this thesis use functional magnetic resonance imaging (fMRI) to study the neural mechanisms of reward learning in humans, the neural(More)
Although schwannomas are commonly found in the head and neck region, their presence in the sinonasal tract involvement is extremely rare, estimated as less than 4%. The presence of these lesions in the frontal sinus are even less common. We report two patients with schwannomas originating in the frontal sinus, with variable degrees of extension. These(More)
I consider the role of automatic psychological and neural processes in different settings. First, how does advertising affect consumer perceptions of a product? I assert that one of the major mechanisms used in marketing is the creation of implicit associations among concepts. A neuralnetwork framework is adapted to model how these associations evolve and(More)