5 documents found, page 1 of 1
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...
Snakes elicit earlier, and monkey faces, later, gamma oscillations in macaque p...
Le, Quan Van; Isbell, Lynne A.; Matsumoto, Jumpei; Le, Van Quang; Nishimaru, Hiroshi; Hori, Etsuro; Maior, Rafael Plakoudi Souto; Tomaz, CarlosGamma oscillations (30–80 Hz) have been suggested to be involved in feedforward visual information processing, and might play an important role in detecting snakes as predators of primates. In the present study, we analyzed gamma oscillations of pulvinar neurons in the monkeys during a delayed non-matching to sample task, in which monkeys were required to discriminate 4 categories of visual stimuli (snakes, mon...
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...