Related Experiment Video
Updated: May 23, 2026
07:14
A Comparative Approach for Quantitative Cell Counting Studies in Widely Different Mammalian Brains
Published on: January 16, 2026
Explaining brain size variation: from social to cultural brain
Carel P van Schaik1, Karin Isler, Judith M Burkart
1Anthropological Institute & Museum, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. vschaik@aim.uzh.ch
Trends in Cognitive Sciences
|April 20, 2012
Summary
The social brain hypothesis explains brain size variation but has limitations. We propose cultural intelligence, integrating social learning and behavioral flexibility, to better understand cognitive evolution in birds and mammals.
Area of Science:
- Evolutionary biology
- Comparative psychology
- Neuroscience
Background:
- The social brain hypothesis is widely accepted for mammalian brain size evolution.
- It fails to explain grade shifts in brain size and the link between socio-cognitive and general cognitive abilities.
Purpose of the Study:
- To address limitations of the social brain hypothesis.
- To propose a new framework, cultural intelligence, for understanding cognitive evolution.
Main Methods:
- Comparative analysis of brain size and social organization in birds and mammals.
- Integration of existing data on cognitive abilities and social learning.
Main Results:
- Identified limitations in the social brain hypothesis regarding grade shifts and general cognition.
- Proposed cultural intelligence as a unifying framework.
Conclusions:
- Cultural intelligence offers a more comprehensive explanation for cognitive evolution.
- Highlights the importance of brain tissue costs, behavioral flexibility, and social learning.
Related Concept Videos
01:30Biological Influences on Intelligence
Intelligence is often thought to be linked to brain size, but the relationship is more complex than that. While brain size does correlate modestly with some abilities, like verbal skills, the connection is weaker for others, such as spatial reasoning. Other factors, like brain structure, also play crucial roles. For instance, despite Einstein's smaller-than-average brain, his parietal cortex, which is involved in spatial reasoning, was 15% wider, suggesting that neural density might matter more...
01:20Anatomy of the Brain: Major Regions
The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
The cerebrum is the largest section of the brain and divides into left and right hemispheres, separated by a deep fissure. The cerebral outer layer of grey matter — the cerebral cortex — comprises elevations called gyri and shallow groves called sulci. The inner portion of white matter includes long nerve fibers known as axons, which connect various areas...
The cerebrum is the largest section of the brain and divides into left and right hemispheres, separated by a deep fissure. The cerebral outer layer of grey matter — the cerebral cortex — comprises elevations called gyri and shallow groves called sulci. The inner portion of white matter includes long nerve fibers known as axons, which connect various areas...
01:30Organization of the Brain
The brain is an integral component of the nervous system and serves as the center for processing sensory inputs, making decisions, and directing bodily actions. This complex organ is organized into three primary sections: the hindbrain, midbrain, and forebrain, each responsible for a range of vital functions.
Hindbrain
The hindbrain, located at the base of the brain, plays a vital role in regulating automatic processes that sustain life. It includes the medulla oblongata, which is essential for...
Hindbrain
The hindbrain, located at the base of the brain, plays a vital role in regulating automatic processes that sustain life. It includes the medulla oblongata, which is essential for...
01:28Causes of Social Behavior III: Biological and Environmental Influences
Social behavior is a complex phenomenon that arises from the interaction between biological predispositions and environmental influences. This intricate interplay shapes how individuals think, feel, and act in various social contexts. Understanding these mechanisms requires insights from psychology, neuroscience, genetics, and evolutionary theory.Environmental Influences on Social BehaviorEnvironmental factors, including temperature, odors, and visual stimuli, play a crucial role in shaping...
01:23The Role of Culture
Culture plays a crucial role in shaping self-identity and influencing thought and behavior, a foundational interest within social psychology. The multicultural perspective recognizes that individuals do not exist in a vacuum; instead, their experiences, perceptions, and actions are deeply influenced by the intersecting dimensions of their cultural, ethnic, and social group affiliations.Cultural Influence on Self-Identity and Social PerceptionCultural frameworks inform how individuals define...
01:26Cerebrum: Anatomical Overview I
The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...