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We examined the effects of plane rotations on the identification of exemplars of three semantic categories. In the first two experiments line drawings belonging to three categories (animals, inanimate objects, and vegetables) were presented at four orientations (0 degree, 60 degrees, 120 degrees, and 180 degrees of clockwise rotation). The response time was(More)
Temporal lobe epilepsies (TLE) are associated with material-specific memory deficits depending on the side of seizure origin. However, while verbal memory deficits have been consistently reported in patients with left-sided TLE, the relationship between visual memory deficits and right-sided TLE is more complex. Here, we review factors that influence the(More)
The present study aims at analyzing the modulation of two types of event-related potentials originating from the human medial temporal lobe, the rhinal AMTL-N400 and the hippocampal P600 by the processing of famous faces. Therefore, we used a face recognition paradigm in which subjects had to discriminate the faces of famous persons from the faces of(More)
The hemispheric specialization for processing visual stimuli as a function of spatial-frequency content and semantic category was investigated. Spatially filtered pictures of animals and tools were displayed to both hemifields at nine levels of spatial-frequency filtering following a coarse-to-fine design. Results showed a differential hemispheric(More)
The different weight of spatial frequency content in the identification of visual objects was investigated. Subjects were required to identify spatially filtered pictures of animals, vegetables and nonliving objects, displayed at 9 resolution levels of filtering following a coarse-to-fine order. Results showed that spatial frequency content differentially(More)
We administered suggestions to see a gray-scale pattern as colored and a colored pattern in shades of gray to 30 high suggestible and eight low suggestible students. The suggestions were administered twice, once following the induction of hypnosis and once without an induction. Besides rating the degree of color they saw in the stimuli differently,(More)
Limbic event-related potentials related to verbal but not to visual recognition memory have been found to be attenuated within the epileptic hippocampus of patients with temporal lobe epilepsy (TLE). To identify hippocampal contributions to visual processing and memory we recorded intracranial ERPs directly from within the epileptic and the non-epileptic(More)
The category-specific deficit in object identification as function of spatial frequency (SF) content and priming effect was investigated. Twenty-two patients with Alzheimer Disease (AD) and 24 control subjects performed an object identification task. The objects belonged to living and nonliving categories. In the study phase an episodic trace of objects was(More)
Recent studies have shown that involuntary autobiographical memories (IAMs) can be elicited in the laboratory. Here we assessed whether the specific instructions given to participants can change the nature of the IAMs reported, in terms of both their frequency and their characteristics. People were either made or not made aware that the aim of the study was(More)
The medial temporal lobe participates not only in episodic memory, but also in visual object processing. Here we asked whether these processes are linked within the human hippocampus. To this end, we recorded field potentials directly from the hippocampus proper during a visual object decision task in temporal lobe epilepsy patients with either normal or(More)