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Related Concept Videos

Association Areas of the Cortex01:21

Association Areas of the Cortex

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,...
Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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 the...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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.
Somatosensation01:33

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
Lobes of the Cerebrum01:22

Lobes of the Cerebrum

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.
Associative Learning01:27

Associative Learning

Associative learning is a fundamental concept in behavioral psychology, wherein a connection is established between two stimuli or events, leading to a learned response. This process is critical in understanding how behaviors are acquired and modified. Conditioning, the mechanism through which associations are formed, can be divided into two main types: classical conditioning and operant conditioning, each elucidating different aspects of associative learning.
Classical conditioning, also known...

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Related Experiment Video

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
07:08

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Published on: August 1, 2018

Biased associative representations in parietal cortex.

Jamie K Fitzgerald1, David J Freedman, Alessandra Fanini

  • 1Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.

Neuron
|January 15, 2013
PubMed
Summary
This summary is machine-generated.

Neurons in the lateral intraparietal area (LIP) show unexpected biases in stimulus preference, challenging previous assumptions about sensory processing and learned associations. These findings suggest underlying one-dimensional dynamics in neural population activity.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Cognitive Neuroscience

Background:

  • Neurons in sensory cortices exhibit stimulus selectivity, typically spanning sensory space.
  • Some neurons, like those in the lateral intraparietal area (LIP), encode learned or task-dependent sensory features.

Purpose of the Study:

  • To investigate neuronal selectivity for learned associations in the lateral intraparietal area (LIP).
  • To determine if neuronal preferences for associated stimuli are evenly distributed or exhibit biases.

Main Methods:

  • Conducted two associative learning experiments and one perceptual decision experiment.
  • Recorded neuronal activity in the lateral intraparietal area (LIP).
  • Analyzed neuronal preference order for associated stimuli.

Main Results:

  • Observed striking asymmetries in neuronal preference for associated stimuli across experiments.
  • Found that nearly all recorded neurons exhibited a similar order of preference.
  • Ruled out behavioral factors as an explanation for these neuronal biases.

Conclusions:

  • The observed biases in LIP neuronal selectivity are consistent with one-dimensional dynamics in population firing patterns.
  • Recurrent connections in the parietal cortex may drive persistent activity, leading to these observed biases.
  • Findings challenge the assumption of evenly distributed preferences for learned associations in LIP neurons.