Verbal recoding of visual stimuli impairs mentalimagetransformations

An fMRI study of human visual cortex in response to spatiotemporal properties of visual stimuli

  ABSTRACT  Background: The brain response to temporal frequencies (TF) has been already reported, but with no study reported for different TF with respect to various spatial frequencies (SF).  Materials and Methods: fMRI was performed by 1.5T GE-system in 14 volunteers during checkerboard, with TFs of 4, 6, 8 and 10Hz in low and high SFs of 0.5 and 8cpd.  Results: Average percentage BOLD signa...

Contextual determinants of visual recognition with verbal and nonverbal stimuli

Two experiments were conducted to determine whether the presence of a meaningful nonverbal context (i.e., a schematic face) facilitates the recognition of an element (i.e.Ja facial feature) embedded in that context. Verbal stimuli (i.e., letters as elements and words as contexts) were also presented to provide a direct comparison of the context effects with the two lfnes of stimuli. Although th...

Cross-Modal Ranschburg Effects: Examining Within-Sequence Repetitions for Visual-Verbal, Non-Verbal-Visual, and Tactile Stimuli

an fmri study of human visual cortex in response to spatiotemporal properties of visual stimuli

abstract  background: the brain response to temporal frequencies (tf) has been already reported, but with no study reported for different tf with respect to various spatial frequencies (sf).  materials and methods: fmri was performed by 1.5t ge-system in 14 volunteers during checkerboard, with tfs of 4, 6, 8 and 10hz in low and high sfs of 0.5 and 8cpd.  results: average percentage bold signal ...

Affective Visual Stimuli: Characterization of the Picture Sequences Impacts by Means of Nonlinear Approaches

Introduction: The main objective of the present study was to investigate the effect of preceding pictorial stimulus on the emotional autonomic responses of the subsequent one. Methods: To this effect, physiological signals, including Electrocardiogram (ECG), Pulse Rate (PR), and Galvanic Skin Response (GSR) were collected. As these signals have random and chaotic nature, nonlinear dynamics...