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  1. Jonathan N. Daisley, Orsola Rosa Salva, Lucia Regolin & Giorgio Vallortigara (2011). Social Cognition and Learning Mechanisms: Experimental Evidence in Domestic Chicks. Interaction Studies 12 (2):208-232.
    In this paper we review the literature on social learning mechanisms in the domestic chick, focusing largely on work from our own laboratories. The domestic chicken is a social-living bird that searches for food in flocks, avoids predators by following warnings from other flock members, and forms (stable) social hierarchies. All of these behaviors develop throughout ontogeny, largely during the very early stages post-hatch. Newly hatched chicks appear to have predispositions to orient towards and to pay greatest attention to the (...)
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  2. Rosa Rugani, Lucia Regolin & Giorgio Vallortigara (2011). Summation of Large Numerousness by Newborn Chicks. Frontiers in Psychology 2:179.
    Newly-hatched domestic chicks, reared with identical objects, when presented with sets of 3 vs. 2 objects disappearing one-by-one behind separate screens, spontaneously inspected the screen occluding the larger set; even when the continuous variables (area or perimeter) were controlled for (Rugani et al., 2009). Here, using a similar paradigm, we investigated the ability of chicks to perform addition on larger sets of objects. Chicks imprinted on 5 identical objects, were presented at test with 6 vs. 9 objects which disappeared one-by-one (...)
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  3. Daniel B. M. Haun, Fiona M. Jordan, Giorgio Vallortigara & Nicky S. Clayton (2010). Origins of Spatial, Temporal and Numerical Cognition: Insights From Comparative Psychology. Trends in Cognitive Sciences 14 (12):552-560.
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  4. Valeria Anna Sovrano, Angelo Bisazza & Giorgio Vallortigara (2005). Animals' Use of Landmarks and Metric Information to Reorient: Effects of the Size of the Experimental Space. Cognition 97 (2):121-133.
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  5. Giorgio Vallortigara & Lesley J. Rogers (2005). Forming an Asymmetrical Brain: Genes, Environment, and Evolutionarily Stable Strategies. Behavioral and Brain Sciences 28 (4):615-623.
    The present response elaborates and defends the main theses advanced in the target article: namely, that in order to provide an evolutionary account of brain lateralization, we should consider advantages and disadvantages associated both with the individual possession of an asymmetrical brain and with the alignment of the direction of lateralization at the population level. We explain why we believe that the hypothesis that directional lateralization evolved as an evolutionarily stable strategy may provide a better account than alternative hypotheses. We (...)
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  6. Giorgio Vallortigara & Lesley J. Rogers (2005). Survival with an Asymmetrical Brain: Advantages and Disadvantages of Cerebral Lateralization. Behavioral and Brain Sciences 28 (4):575-589.
    Recent evidence in natural and semi-natural settings has revealed a variety of left-right perceptual asymmetries among vertebrates. These include preferential use of the left or right visual hemifield during activities such as searching for food, agonistic responses, or escape from predators in animals as different as fish, amphibians, reptiles, birds, and mammals. There are obvious disadvantages in showing such directional asymmetries because relevant stimuli may be located to the animal's left or right at random; there is no a priori association (...)
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  7. Valeria Anna Sovrano, Angelo Bisazza & Giorgio Vallortigara (2002). Modularity and Spatial Reorientation in a Simple Mind: Encoding of Geometric and Nongeometric Properties of a Spatial Environment by Fish. Cognition 85 (2):B51-B59.
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  8. Giorgio Vallortigara & Valeria Anna Sovrano (2002). Conjoining Information From Different Modules: A Comparative Perspective. Behavioral and Brain Sciences 25 (6):701-702.
    The hypothesis that nonhuman species, lacking verbal language, do not really integrate information from different modules, but use instead information sequentially, appears difficult to put under empirical scrutiny. Evidence is discussed showing that in nonhuman species storing of geometric information occurs spontaneously even when landmark information suffices for spatial reorientation, suggesting simultaneous encoding, if not use, of information from different modules.
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  9. Giorgio Vallortigara & Luca Tommasi (2001). Minimization of Modal Contours: An Instance of an Evolutionary Internalized Geometric Regularity? Behavioral and Brain Sciences 24 (4):706-707.
    The 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. [Shepard].
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  10. Giorgio Vallortigara (1999). Segregation and Integration of Information Among Visual Modules. Behavioral and Brain Sciences 22 (3):398-399.
    It is argued that the alleged cases of cognitive penetration of visual modules actually arise from the integration of information among different modules. This would reflect a general computational strategy according to which constraints to a particular module would be provided by information coming from different modules. Examples are provided from the integration of stereopsis and occlusion and from computation of motion direction.
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  11. Giorgio Vallortigara (1998). Minds of Their Own. Trends in Cognitive Sciences 2 (3):118.
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  12. Sergio Cesare Masin, Giuliana Mazzoni & Giorgio Vallortigara (1987). An Experimental Study of the Alphabetical Rating. Bulletin of the Psychonomic Society 25 (4):259-262.
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