The expanded, front section of the central nervous system located within the skull. It is an incredibly intricate organ made up of billions of interconnected neurons and glial cells. The brain is a bilateral structure, meaning it has two sides, and can be divided into distinct lobes. Each lobe is linked to specific functions, but all parts of the brain work together to underpin our thoughts and behaviors.

Brain

Functioning as the vital link between the brain and the external world, the spinal cord acts as an intelligent relay station. It is responsible for routing messages between the brain and the body through all of its segments, and it also independently manages a system of automatic processes known as reflexes.

Spinal Cord

The endocrine system is a network of glands responsible for secreting hormones that regulate normal bodily functions.

Endocrine System

Psychologists who aim to study the human mind require a basic understanding of the two primary subdivisions of the nervous system:
- Central Nervous System (CNS)
- Peripheral Nervous System (PNS) 

Parts of the Nervous System

The spinal cord can be conceptualized as an extension of the brain. It serves as the primary pathway for communication, enabling the brain to influence and interact with the rest of the body and the external environment.

The Brain and the Spinal Cord

Psychologists study genetics to better understand the biological foundations of behavior. Although humans share common biological mechanisms and structures, such as brains, hormones, and genetic codes, these elements are expressed in a vast diversity of individual behaviors, thoughts, and reactions. This field explores how inherited traits contribute to this uniqueness and influence both physiological and psychological characteristics.

Human Genetics

The nervous system is comprised of two primary cell types: neurons and glial cells. Neurons act as the main information processors, and the communication between them is essential for all nervous system functions. Glial cells, or glia, primarily serve in supporting roles for the neurons.

Cells of the Nervous System

Biopsychology involves the study of:
* Human Genetics
* Cells of the Nervous System
* Parts of the Nervous System
* The Brain and Spinal Cord
* The Endocrine System

Trinity College (CT)

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Biopsychology, also known as biological psychology, is a subfield of psychology that examines the influence of biological processes on behavior. It typically focuses on the immediate causes of behavior rooted in the physiology of an organism, with a primary emphasis on the nervous system's structure and function. This field is highly interdisciplinary, drawing on expertise from researchers with backgrounds in biology, medicine, physiology, and chemistry, and is considered a key component within the broader field of neuroscience.

Biopsychology (Biological Psychology)

Spielman, R. M., Jenkins, W. J., & Lovett, M. D. (2020, April 22). Psychology (2nd ed.). OpenStax. https://openstax.org/books/psychology-2e/pages/1-introduction

OpenStax Psychology (2nd ed.) Textbook

The study of the neural mechanisms of behavior through direct manipulation of the brains of nonhuman animal subjects in controlled experiments.

Physiological Psychology

The study of the effects of drugs on the brain and behavior.

Psychopharmacology 

The study of the relation between physiological activity and psychological processes in human subjects by noninvasive methods.

Psychophysiology

The study of the evolution, genetics, and adaptiveness of behavior, often by using the comparative approach.

Comparative Psychology 

The study of the physiological basis for cognition.

Cognitive Neuroscience

Psycho-oncology is the study of physical/biological and social aspects of life with cancer. Its goal is to improve quality of life and to treat emotional and physical symptoms related to cancer treatment and lifestyle.  

Psycho-oncology 

Areas of Biopsychological Study

As per the biopsychosocial model, the biology, psychology, and social elements of a person interact, which influences that person's health.

Biopsychosocial Model

Biopsychological research is characterized by its interdisciplinary nature, frequently combining the research strategies of both psychologists and physiologists. This integrated approach is employed to investigate the relationship between the nervous system and behavior.

Interdisciplinary Research in Biopsychology

Biopsychology and evolutionary psychology differ in their primary focus. Biopsychology typically investigates the immediate, physiological causes of behavior within an organism. In contrast, evolutionary psychology seeks to understand the ultimate biological causes of behavior, examining how behaviors have evolved as adaptations over time.

Comparison between Biopsychology and Evolutionary Psychology

A researcher is investigating why a person's heart rate increases and their palms sweat when they encounter a sudden, frightening stimulus. Which of the following research questions best represents a biopsychological approach to understanding this reaction?

Biological psychologists investigate a wide array of topics to understand the link between biology and behavior. Key areas of study include sensory and motor systems, sleep patterns, the effects of drug use and abuse, ingestive behaviors like eating and drinking, and reproductive behaviors. Research also extends to neurodevelopment, the plasticity of the nervous system, and the biological underpinnings of psychological disorders.

Domains of Biopsychological Research

An example of a topic studied in biological psychology is how cellular changes in the hippocampus—a brain structure critical for learning and memory—relate to memory formation. A researcher investigating these structural and biological mechanisms to understand how memories are created would most likely identify as a biological psychologist.

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