Localization and scale
Association areas represent the most evolutionarily young and complex part of the cerebral cortex. In the human brain, this structure is extremely developed and occupies up to 70% of the neocortex (new cortex).
Topographically, this vast territory is not a single continuous mass. Traditionally, two main association regions are distinguished:
- Frontal region;
- Parieto-temporo-occipital region.
Each of these areas assumes specific tasks for analyzing and synthesizing information coming from the external and internal environment of the organism.
Main functions of association areas
The main task of this part of the cortex is higher-order analysis of incoming signals. Unlike projection areas, which are engaged in primary processing, the associative cortex performs complex synthesis of somatosensory, gustatory, and visual information.
Depending on the specific area, functions are strictly specialized:
- The frontal region plays a key, leading role in planning and developing behavioral strategies. This function is especially prominent when an organism needs to abruptly change its action plan (during behavioral switching).
- The temporal lobe is closely connected with information retention mechanisms and takes a direct part in the formation of long-term memory.
In addition, it is precisely within the structures of the associative cortex that the most critical stage of any goal-directed act takes place — evaluation of achieved results. Physiologically, this is described as the functioning of the action result acceptor.
Neurophysiology and mechanisms of convergence
The secret behind the complexity of computational processes in the associative cortex lies in its connections and the properties of individual cells. The source of excitation for these areas is not direct signals from receptors, but impulses arriving from other projection and adjacent association areas of the cortex.
The key physiological property of neurons in these regions is the ability to undergo convergence (signal convergence):
- Multisensory convergence: signals of completely different sensory modalities converge simultaneously on the same neurons. For example, a cell can simultaneously process information from the visual, auditory, and tactile receptors.
- Multibiological convergence: this is the process of convergence of excitations having different biological modalities. This phenomenon is made possible by generalized ascending activating influences that "rise" from the lower parts of the CNS to the cortex.
Briefly: answers to topical questions
What specific functions does the parieto-temporo-occipital association area perform?
The parieto-temporo-occipital region is one of the main association areas of the cortex.
Source-confirmed functions and characteristics:
- Higher-order analysis of somatosensory, gustatory, and visual signals.
- Multisensory convergence — the convergence on neurons of signals from various sensory modalities: vision, hearing, touch, etc.
- Information integration — the posterior part of the parietal lobe and associative visual areas of the cortex provide integration of somatosensory, visual, and motor information.
Anatomically, the general association area at the junction of the parietal, occipital, and temporal lobes is located in the region of the angular gyrus (gyrus angularis).
Mnemonic (FLT): Frontal — plans (strategy), Temporal — remembers (long-term memory), Parieto-occipital — processes vision and somatosensation.
Class and exam questions
Where does the associative cortex receive excitatory signals from?
Unlike primary areas, it receives impulses not directly from receptors, but from other projection and association areas of the cortex.
What is multisensory convergence?
This is a fundamental property of associative cortex neurons, where signals of different natures (e.g., vision, hearing, and touch) converge on a single cell.
Which cortical area is responsible for switching behavioral acts?
The frontal association area is responsible for developing behavioral strategies and switching between behavioral acts.
What else to study on this topic
- Mechanisms of long-term memory formation in the temporal lobe
- The working principle of the action result acceptor
- Generalized ascending activating influences
- Features of neuronal multibiological convergence
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