Related Experiment Video
Updated: Jun 17, 2025
07:08
Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
Published on: August 1, 2018
8.3K
Monkey lateral prefrontal cortex subregions differentiate between perceptual exposure to visual stimuli.
Kyoko Leaman1, Nadira Yusif Rodriguez1, Aarit Ahuja1
1Department of Neuroscience, Brown University.
Biorxiv : the Preprint Server for Biology
|August 12, 2024
Summary
The posterior ventral area 46 (p46v) in the lateral prefrontal cortex (LPFC) preferentially activates to less familiar visual stimuli. This finding helps localize perceptual exposure processing within the primate brain.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Primate Brain Research
Background:
- Humans process visual stimuli with varying levels of familiarity daily.
- Neural correlates of visual stimulus exposure exist in the primate lateral prefrontal cortex (LPFC).
- Specific subregions within the LPFC responsible for exposure-dependent responses remain unclear.
Purpose of the Study:
- To investigate whether the posterior fundus of area 46 (p46f) or the posterior ventral area 46 (p46v) shows preferential activation to less frequently presented stimuli.
- To determine if p46v, adjacent to novelty-responsive regions, exhibits exposure-dependent responses.
- To further localize perceptual exposure processing within the primate LPFC.
Main Methods:
- Awake functional magnetic resonance imaging (fMRI) was performed on three male monkeys.
- Monkeys observed visual stimuli with varying daily presentation frequencies.
- Neural activity in p46f and p46v was compared in response to these stimuli.
Main Results:
- The p46v subregion demonstrated preferential activation to stimuli with low perceptual exposure.
- The p46f subregion did not show a significant response to less frequently presented stimuli.
- These findings localize exposure-dependent effects to p46v within the primate LPFC.
Conclusions:
- The p46v, not p46f, is implicated in processing perceptual exposure to visual stimuli.
- Results support the proposed sequence-specific function of p46f.
- This study refines our understanding of LPFC subregion specialization and perceptual processing.
Related Concept Videos
01:21Association Areas of the Cortex
5.2K
Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
5.2K
01:14Motor and Sensory Areas of the Cortex
3.6K
The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
3.6K
01:22Lobes of the Cerebrum
598
The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements....
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements....
598
01:24Vision
53.1K
Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
53.1K
01:24Somatosensory, Motor, and Association Cortex
455
The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
455
01:20Parallel Processing
147
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
147