1,721,309 research outputs found
Lateral asymmetries during responses to novel-coloured objects in the domestic chick: A developmental study
No full textThe evolution of brain lateralization: a game theoretical analysis of population structure
No full textFigure ground segregation modulates perceived direction of ambiguous moving gratings and plaids
No full textA translating oriented grating viewed through a circular aperture with an occluding area in the middle appeared to move alternately in an oblique or in a vertical direction depending on the foreground/background assignment on the central occluding area. The effect occurred even when the central area was simply removed from the display, thus giving rise to a 'subjective' occluder. Parametric studies revealed that the probability of seeing oblique or vertical motion was affected by the size of the central area but not by its contrast relationships with the grating. Similar phenomena of ambiguous motion direction were observed using changes in colour along a translating grating that produced neon colour spreading effects, or using oriented edge discontinuities that collapsed into subjective plaids composed of two one- dimensional gratings. These results are discussed with respect to the hypothesis that surface segmentation mechanisms play a crucial part in the interpretation of motion signals
Minimization of modal contours: An instance of an evolutionary internalized geometric regularity?
No full textThe stratification in depth of chromatically homogeneous overlapping figures depends on a minimization rule which assigns the status of being "in front" to the figure that requires the formation of shorter modal contours. This rule has been proven valid also in birds, whose visual neuroanatomy is radically different from that of other mammals, thus suggesting an example of evolutionary convergence toward a perceptual universal
Is there an innate geometric module? Effects of experience with angular geometric cues on spatial re-orientation based on the shape of the environment.
No full text
Chicks' use of geometrical and nongeometrical information in environments of different sizes
No full text[No abstract available
Hemispheric processing of landmark and geometric information in male and female domestic chicks (Gallus gallus)
No full textA place learning paradigm was used to assess lateralisation and sex differences in domestic chicks dealing with global (geometric shape) and local (identity of a beacon) aspects of spatial encoding. Male and female domestic chicks were trained binocularly to localise food buried under sawdust in the centre of a square-shaped enclosure. They were then tested binocularly and monocularly (Experiment 1). Training in the same task was also carried out in the presence of a centrally placed visual beacon, so that chicks could then be tested in a number of transformed versions of the training arrangement: after removing the beacon (Experiment 2), after shifting the beacon to a corner (Experiment 3) and after simultaneously shifting the beacon to a corner and replacing it with a second, visually different, beacon (Experiment 4). Results show that the right hemisphere prevalently attends to the geometry of the environment in both male and female chicks. Males rely upon local information (beacon) more than females, also showing stronger encoding of this information in their left hemisphere than their right hemisphere
- …
