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This research comparatively assessed grouping mechanisms of humans (n = 8) and baboons (n = 8) in an illusory task that employs configurations of target and surrounding circles arranged to induce the Ebbinghaus (Titchener) illusion. Analyses of response behaviors and points of subjective equality demonstrated that only humans misjudged the central target(More)
This study was aimed at comparing the effects of damage to the entorhinal cortex and retrosplenial cortex on exploration and reaction-to-change in rats. Following habituation to a configuration of objects, a familiar object was displaced therefore producing a spatial change. A non-spatial change was made by substituting a familiar object by a novel object.(More)
It is widely accepted that autistic children experience difficulties in processing and recognizing emotions. Most relevant studies have explored the perception of faces. However, context and bodily gestures are also sources from which we derive emotional meanings. We tested 23 autistic children and 23 typically developing control children on their ability(More)
Rats with entorhinal cortex lesions were trained in two versions of the place navigation task in the Morris water maze. In the distal condition, they had to locate the hidden platform on the basis of remote landmarks, while in the proximal condition, they had to rely only on a configuration of proximal objects, placed directly in the pool. Entorhinal rats(More)
It has been recently shown that lesions of parahippocampal areas including the entorhinal cortex do not disrupt place learning in the water maze, suggesting that the hippocampo-cortical circuitry is not important for spatial memory [Burwell RD, Saddoris MP, Bucci DJ, Wiig KA. Corticohippocampal contributions to spatial and contextual learning. J Neurosci(More)
This study assessed how pictorially naïve nonhuman primates understand pictures. Fifty-five baboons with no prior exposure to pictures were trained to grasp a slice of banana presented against a pebble in a two alternative forced choice task. Post-training testing involved three stimulus pairs: (1) real banana slice vs. its picture, (2) the banana picture(More)
Rats with lesions of the entorhinal or parietal cortex were tested in a homing task on a circular platform containing food cups and surrounded by curtains. The animals had to leave a refuge, explore the platform to find a hidden piece of food and carry it back to the refuge. Once the rats were proficient at performing the procedural aspects of the task,(More)
The Ebbinghaus (Titchener) illusion was examined in a remote culture (Himba) with no words for geometric shapes. The illusion was experienced less strongly by Himba compared with English participants, leading to more accurate size contrast judgments in the Himba. The study included two conditions of inducing stimuli. The illusion was weaker when the(More)
P erhaps the most well-known work by the Belgian surrealist painter René Magritte is a painting entitled " La trahison des images " (The treason of images), from 1929, consisting of a brown smoking pipe suspended upon a uniform background with the caption " Ce n'est pas une pipe " (This is not a pipe). Magritte's intent was to challenge observers'(More)
Analogical reasoning is a corner stone of human cognition, but the phylogenetic origins of this skill are still unknown. Recent animal studies have suggested that only apes can solve the 2- by 2-item relational matching (RMTS) analogy problem, with potential benefits of language- (Premack, 1983) or token-training procedures (Thompson, Oden, & Boysen, 1997).(More)