28 documents found, page 1 of 3
Population coding of facial information in the monkey superior colliculus and p...
Nguyen, Huy Hoang; Nishimaru, Hiroshi; Matsumoto, Jumpei; Le, Quan Van; Hori, Etsuro; Maior, Rafael Plakoudi Souto; Tomaz, Carlos Alberto BezerraThe superior colliculus (SC) and pulvinar are thought to function as a subcortical visual pathway that bypasses the striate cortex and detects fundamental facial information. We previously investigated neuronal responses in the SC and pulvinar of monkeys during a delayed nonmatching-to-sample task, in which the monkeys were required to discriminate among 35 facial photos of five models and other categories of v...
Neuronal response sto face-like and facial stimuli in the monkey superior colli...
Nguyen, Minh Nui; Matsumoto, Jumpei; Hori, Etsuro; Maior, Rafael Plakoudi Souto; Tomaz, Carlos Alberto Bezerra; Tran, Anh Hai; Ono, TaketoshiThe superficial layers of the superior colliculus (sSC) appear to function as a subcortical visual pathway that bypasses the striate cortex for the rapid processing of coarse facial information. We investigated the responses of neurons in the monkey sSC during a delayed non-matching-to-sample (DNMS) task in which monkeys were required to discriminate among five categories of visual stimuli [photos of faces with...
Monkey pulvinar neurons fire differentially to snake postures
Le, Quan Van; Isbell, Lynne A.; Matsumoto, Jumpei; Le, Van Quang; Hori, Etsuro; Tran, Anh Hai; Maior, Rafael Plakoudi SoutoThere is growing evidence from both behavioral and neurophysiological approaches that primates are able to rapidly discriminate visually between snakes and innocuous stimuli. Recent behavioral evidence suggests that primates are also able to discriminate the level of threat posed by snakes, by responding more intensely to a snake model poised to strike than to snake models in coiled or sinusoidal postures (Etti...
Sensorimotor gating impairments induced by MK-801 treatment may be reduced by t...
Saletti, Patrícia Grandizoli; Maior, Rafael Plakoudi Souto; Hori, Etsuro; Nishijo, Hisao; Tomaz, Carlos Alberto BezerraDizocilpine (MK-801) is a non-competitive NMDA antagonist that induces schizophreniclike effects. It is therefore widely used in experimental models of schizophrenia including prepulse inhibition (PPI) impairments in rodents. Nevertheless, MK-801 has never been tested in monkeys on a PPI paradigm. In order to evaluate MK-801 effects on monkeys’ PPI, we tested eight capuchin monkeys (Sapajus spp.) using three di...
Mercury pollution and congenital malformations detected at birth in Porto Velho...
Rocha, Julio Cesar da; Maior, Rafael Plakoudi Souto; Tomaz, Carlos Alberto BezerraThe possible negative impacts of mercury contamination in the Madeira river, State of Rondonia, Brazil, on newborn babies health were evaluated. The incidence of congenital malformations was surveyed from the records of newborns in the main hospital of Porto Velho, Rondonia, from 1997 to 2007. The type of malformations between local population and cases transferred from other areas in Rondonia were compared. Ne...
Cognitive anosognosia and behavioral changes in probable Alzheimer's disease pa...
Satler, Corina Elizabeth; Tomaz, Carlos Alberto BezerraAnosognosia, comprometimento do insight e ausência de reconhecimento de déficits são usados como termos equivalentes neste estudo. Objetivo: Investigar a relação entre a presença de sintomas de anosognosia e domínios cognitivos, habilidades funcionais, e sintomas neuropsiquiátricos em pacientes com provável doença de Alzheimer (pAD) e idosos controles. Métodos: vinte e um pDA (14 mulheres) e vinte e dois EC (16...
Fast detector/first responder : interactions between the superior colliculus-pu...
Soares, Sandra C.; Maior, Rafael Plakoudi Souto; Isbell, Lynne A.; Tomaz, Carlos Alberto Bezerra; Nishijo, HisaoPrimates are distinguished from other mammals by their heavy reliance on the visual sense, which occurred as a result of natural selection continually favoring those individuals whose visual systems were more responsive to challenges in the natural world. Here we describe two independent but also interrelated visual systems, one cortical and the other subcortical, both of which have been modified and expanded i...
Comparative anatomy of the hind limb vessels of the bearded Capuchins (Sapajus ...
Aversi-Ferreira, Roqueline Ametila Glória Martins de Freitas; Abreu, Tainá de; Pfrimer, Gabriel A.; Silva, Sylla F.; Ziermann, Janine M.Capuchin monkeys are known to exhibit sporadic bipedalism while performing specific tasks, such as cracking nuts.The bipedal posture and locomotion cause an increase in the metabolic cost and therefore increased blood supply to lower limbs is necessary. Here, we present a detailed anatomical description of the capuchin arteries and veins of the pelvic limb of Sapajus libidinosus in comparison with other primate...
Cannabidiol affects MK-801-induced changes in the PPI Learned Response of Capuc...
Saletti, Patrícia Grandizoli; Maior, Rafael Plakoudi Souto; Barros, Marília; Nishijo, Hisao; Tomaz, Carlos Alberto BezerraThere are several lines of evidence indicating a possible therapeutic action of cannabidiol (CBD) in schizophrenia treatment. Studies with rodents have demonstrated that CBD reverses MK-801 effects in prepulse inhibition (PPI) disruption, which may indicate that CBD acts by improving sensorimotor gating deficits. In the present study, we investigated the effects of CBD on a PPI learned response of capuchin monk...
Comparative anatomical analyses of the forearm muscles of Cebus libidinosus (Ry...
Aversi-Ferreira, Tales Alexandre; Maior, Rafael Plakoudi Souto; Silva, Frederico Ozanam Carneiro eThe present study describes the flexor and extensor muscles in Cebus libidinosus' forearm and compares them with those from humans, chimpanzees and baboons. The data is presented in quantitative anatomical indices for similarity. The capuchin forearm muscles showed important similarities with chimpanzees and humans, particularly those that act on thumb motion and allow certain degree of independence from other ...