Many non-human primates have been observed to reciprocate and understand reciprocity in one-to-one social exchanges. A recent study demonstrated that capuchin monkeys are sensitive both third-party violation of reciprocity; however, whether this sensitivity is a function general intelligence, evidenced by their larger brain size relative other primates, remains unclear. We hypothesized highly pro-social even with relatively smaller brain, would be others' reciprocity. Here, we show common...

Mirror neurons respond when executing a motor act and observing others' similar act. So far, mirror have been found only in macaques, humans songbirds. To investigate the degree of phylogenetic specialization during course their evolution, we determined whether with properties to macaques occur New World monkey, common marmoset (Callithrix jacchus). The ventral premotor cortex (PMv), where reported is difficult identify marmosets, since no sulcal landmarks exist frontal cortex. We addressed...

We recorded the activities of neurons in lateral surface posterior inferior temporal cortex (PIT) 3 hemispheres monkeys performing a visual fixation task. characterized color and shape selectivities each neuron, mapped its receptive field (RF), studied distributions these response properties. Using set stimuli that were systematically distributed Commission Internationale de l'Eclairage-xy chromaticity diagram, we found numerous color-selective throughout area examined. Neurons ventral...

Appearance of a color stimulus is significantly affected by the contrast between its luminance and background. In present study, we used stimuli evenly distributed on CIE-xy chromaticity diagram to examine how affects neural representation in V4 anterior inferior temporal (AITC) posterior (PITC) areas (Banno et al., 2011). The activities single neurons were recorded from monkeys performing visual fixation task, effects selectivity individual their population responses systematically examined...

Abstract Natural sound is composed of various frequencies. Although the core region primate auditory cortex has functionally defined frequency preference maps, how map organized in areas belt and parabelt regions not well known. In this study, we investigated functional organizations core, belt, encompassed by lateral sulcus superior temporal common marmoset ( Callithrix jacchus ). Using optical intrinsic signal imaging, obtained evoked responses to band-pass noise stimuli a range...

Cortical areas in the superior temporal sulcus (STS) of primates have been recognized as a part 'social brain'. In particular, biological motion stimuli elicit neuronal responses STS, indicating their roles ability to understand others' actions. However, spatial organization functionally identified STS cells is not well understood because it difficult identify precise locations sulcal regions. Here, using small New World monkey, common marmoset (Callithrix jacchus) that has lissencephalic...

The inferior temporal (IT) cortex is the last unimodal visual area in ventral pathway and essential for color discrimination. Recent imaging electrophysiological studies have revealed presence of several distinct patches color-selective cells anterior IT (AIT) posterior (PIT). To understand neural machinery processing cortex, present study, we combined anatomical tracing methods with unit recordings to investigate connections identified clusters monkey cortex. We found that a cluster AIT...

The common marmoset (Callithrix jacchus) is one of the smallest species primates, with high visual recognition abilities that allow them to judge identity and quality food objects in their environment. To address cortical processing information related material surface features marmosets, we presented a set stimuli have identical three-dimensional shapes (bone, torus or amorphous) but different appearances (ceramic, glass, fur, leather, metal, stone, wood, matte) anesthetized marmoset,...

Summary Although previous studies have identified neural mechanisms that may underlie auditory scene analysis, the relationship between these and behavior remains elusive. To fill gaps, we recorded multiunit activity (MUA) from posterior anterior fields while monkeys participated in an streaming task. We found MUA magnitude was reduced as stimulus unfolded over time, this reduction depended on frequency difference tone bursts comprising stimulus. then examined whether frequency-dependent...

Although previous studies have identified neural mechanisms that may underlie auditory scene analysis, the relationship between these and behavior remains elusive. To fill gaps, we recorded multiunit activity (MUA) from posterior anterior fields while monkeys participated in an streaming task. We found MUA magnitude was reduced as stimulus unfolded over time, this reduction depended on frequency difference tone bursts comprising stimulus. then examined whether frequency-dependent could be...

A fundamental goal of the auditory system is to group stimuli from environment into a perceptual unit (i.e., "stream") or segregate multiple different streams. Although previous studies have clarified psychophysical and neural mechanisms that may underlie this ability, relationship between these remains elusive. Here, we recorded multiunit activity (MUA) cortex monkeys while they participated in an auditory-streaming task consisting interleaved low- high-frequency tone bursts. As streaming...

Gold, silver, or bronze are perceived in metallic, glossy surfaces with certain chromaticity ranges. However, it is not known yet how gold depends on the metallic perception. The present study compared perceptual degree of goldenness and perception gloss to investigate underlying mechanisms for gloss. We simulated non-metallic objects (sphere Stanford Bunny 26-faceted polyhedron) by 3DCG be used as stimuli experiments. These images were morphed luminance make different levels. each image was...

Although the relationship between color signal and luminance is an important problem in visual perception, relatively little known about how contrast affects responses of selective neurons cortex. In this study, we examined inferior temporal (IT) awake monkey performing a fixation task. Single neuron activities were recorded from anterior posterior regions IT cortex (AITC PITC) identified previous studies where are accumulated. Color stimuli consisted 28 that evenly distribute across gamut...