scholarly journals Color Selectivity of Neurons in the Posterior Inferior Temporal Cortex of the Macaque Monkey

2009 ◽  
Vol 20 (7) ◽  
pp. 1630-1646 ◽  
Author(s):  
M. Yasuda ◽  
T. Banno ◽  
H. Komatsu
Keyword(s):  
Temporal Cortex ◽  
Macaque Monkey ◽  
Inferior Temporal Cortex ◽  
Color Selectivity

Functional mapping of the inferior temporal cortex (IT) of the macaque monkey

1988 ◽  
Vol 7 ◽  
pp. S212
Author(s):  
Keiji Tanaka ◽  
Hide-Aki Saito ◽  
Yoshiro Fukada ◽  
Madoka Fukumoto
Keyword(s):  
Temporal Cortex ◽  
Macaque Monkey ◽  
Functional Mapping ◽  
Inferior Temporal Cortex

Relationships between color, shape, and pattern selectivities of neurons in the inferior temporal cortex of the monkey

1993 ◽  
Vol 70 (2) ◽  
pp. 677-694 ◽  
Author(s):  
H. Komatsu ◽  
Y. Ideura
Keyword(s):  
Anterior Part ◽  
Statistical Significance ◽  
Temporal Cortex ◽  
Selectivity Index ◽  
Inferior Temporal Cortex ◽  
Contour Shape ◽  
Color Selectivity ◽  
A Cell ◽  
Standard Sets ◽  
Preferred Stimulus

1. To examine the way in which information from different visual submodalities is integrated in the inferior temporal (IT) cortex of the monkey, we studied the relationships between the color, shape, and pattern selectivities of individual neurons in IT cortex of two awake macque monkeys. Neurons were recorded while each animal performed a visual fixation task. For each neuron, we analyzed selectivity for the visual submodalities of color, contour shape, and textural pattern using preselected standard sets of visual stimuli, namely colored geometrical shapes with certain patterns. 2. About two thirds (62%) of single neurons whose activities were recorded from the anterior part of IT cortex, which included the ventral bank of the superior temporal sulcus, responded to one or more of the stimuli in the standard sets of stimuli used. An index (stimulus selectivity index) was calculated for each neuron to quantify how well a cell discriminated the preferred stimulus from the least preferred stimulus in each set of stimuli. The stimulus selectivity index, as well as the statistical significance of the variation in the responses to the stimuli within a given set, was used to classify a cell as selective or not selective in a given submodality. Of the neurons whose responses were analyzed quantitatively, 69% were selective for color, 68% were selective for shape, and 82% were selective for pattern. 3. Of the neurons that were tested with respect to the selectivity for color and for shape, 45% were selective both for color and shape, 50% were selective for either color or shape, and only 5% were not selective for color or shape. These frequencies were not significantly different from those predicted from the occurrence of the selective and nonselective neurons in each submodality if the independence of the selectivities for color and shape is assumed. We also found that the color preference of individual neurons does not depend on the shape of the stimulus. These results indicate that there was no overt interaction between the selectivities for color and shape in these IT neurons. 4. Of the neurons that were compared with respect to the selectivity for color and for pattern, 58% were selective both for color and pattern, 38% were selective for either color or pattern, and only 4% were not selective for color or pattern. There was no correlation between the degree of color selectivity and the degree of pattern selectivity of individual neurons.(ABSTRACT TRUNCATED AT 400 WORDS)

scholarly journals Relationship Between the Activities of Gloss-Selective Neurons in the Macaque Inferior Temporal Cortex and the Gloss Discrimination Behavior of the Monkey

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Mika Baba ◽  
Akiko Nishio ◽  
Hidehiko Komatsu
Keyword(s):  
Causal Relationship ◽  
Discrimination Task ◽  
Temporal Cortex ◽  
Discrimination Performance ◽  
Macaque Monkey ◽  
Inferior Temporal Cortex ◽  
Population Activity ◽  
Electrical Microstimulation ◽  
Neural Activities ◽  
Restricted Region

Abstract In the macaque monkey, neurons that selectively respond to specific gloss are present in a restricted region of the central part of the inferior temporal (IT) cortex. Although the population activity of these neurons is known to represent the perceptual gloss space, the involvement of their activity in gloss perception has not been directly tested. In the present study, we examined the causal relationship between the activities of gloss-selective neurons and gloss perception by applying electrical microstimulation or injection of small amounts of muscimol (GABAA agonist) to manipulate neural activities while monkeys performed a gloss discrimination task. We found that microstimulation within or in the vicinity of the region where gloss-selective neurons were recorded induced bias toward higher gloss judgment. With muscimol injection, gloss discrimination performance was degraded in one monkey after the first injection into the region where gloss-selective neurons were recorded. These results suggest that gloss discrimination behavior is mediated by the activities of a gloss-selective network that includes the gloss-selective region in the central IT cortex examined here.

scholarly journals Color tuning of neurons in face patches of macaque inferior temporal cortex

2019 ◽  
Author(s):  
Marianne Duyck ◽  
Tessa J. Gruen ◽  
Lawrence Y. Tello ◽  
Serena Eastman ◽  
Joshua Fuller-Deets ◽  
...  
Keyword(s):  
Second Harmonic ◽  
Temporal Cortex ◽  
Luminance Contrast ◽  
Macaque Monkey ◽  
Inferior Temporal Cortex ◽  
Color Tuning ◽  
Quantitative Measurements ◽  
Cone Activity ◽  
Insight Into

Previous work has shown that under viewing conditions that break retinal mechanisms for color, one class of objects appears paradoxically colored: faces, and they look green. Interpreted within a Bayesian-observer framework, this observation makes the surprising prediction that face-selective neurons are sensitive to color and weakly biased for colors that elicit L>M cone activity (warm colors). We tested this hypothesis by measuring color-tuning responses of face-selective cells in alert macaque monkey, using fMRI-guided microelectrode recording of the middle and anterior face patches and carefully color-calibrated stimuli. The population of face-selective neurons showed significant color tuning when assessed using images that preserved the luminance contrast relationships of the original face photographs. A Fourier analysis of the color-tuning responses uncovered two components. The first harmonic was biased towards the L>M colors, consistent with the prediction. Interestingly, the second harmonic aligned with the S-cone cardinal axis, which may relate to the computation of animacy by IT cells.SignificanceThe results provide the first quantitative measurements of the color tuning properties of face-selective neurons. The results provide insight into the neural mechanisms that could support the role of color in face perception.

The lateral geniculate nucleus projects to the inferior temporal cortex in the macaque monkey

Neuroreport ◽  
1994 ◽  
Vol 5 (18) ◽  
pp. 2693-2696 ◽  
Author(s):  
Amalia Hernández-González ◽  
Carmen Cavada ◽  
Fernando Reinoso-Suárez
Keyword(s):  
Lateral Geniculate Nucleus ◽  
Temporal Cortex ◽  
Macaque Monkey ◽  
Inferior Temporal Cortex ◽  
Lateral Geniculate
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