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Observational Studies

Observational Studies

Observational studies are a type of analytical study where researchers observe events without any interventions. In other words, the researcher does not influence the response variable or the experiment's outcome.
There are three types of observational studies – Prospective, retrospective, and cross-sectional.
Prospective Study
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Obedience

Obedience

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Cross-Sectional Research

Cross-Sectional Research

In cross-sectional research, a researcher compares multiple segments of the population at the same time. If they were interested in people's dietary habits, the researcher might directly compare different groups of people by age. Instead of following a group of people for 20 years to see how their dietary habits changed from decade to decade, the researcher would study a group of 20-year-old individuals and compare them to a group of 30-year-old individuals and a group of 40-year-old...

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Data Collection by Observations

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Data collection refers to a systematic way of obtaining, observing, measuring, and analyzing accurate information. Observational studies are one of the most widely used methods of data collection. It involves collecting data by observing the behavior and physical characteristics of a sample without making any modifications to the sample.
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Longitudinal Research

Longitudinal Research

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...

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Related Experiment Video

Updated: May 23, 2026

Religious Chanting and Self-Related Brain Regions: A Multi-Modal Neuroimaging Study

Religious Chanting and Self-Related Brain Regions: A Multi-Modal Neuroimaging Study

Published on: May 31, 2024

Overview and findings from the religious orders study.

David A Bennett¹, Julie A Schneider, Zoe Arvanitakis

¹Rush Alzheimer's Disease Center, Rush University Medical Center, 600 S. Paulina, Suite 1028, Chicago, IL 60612, USA. David_A_Bennett@Rush.edu

Current Alzheimer Research

|April 5, 2012

Summary

The Religious Orders Study investigates aging and Alzheimer's disease (AD) through clinical and pathological data. It examines risk factors, clinical outcomes, and neuropathology to understand AD progression.

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Published on: November 4, 2021

Area of Science:

Neuroscience
Gerontology
Pathology

Background:

The Religious Orders Study is a long-term clinical-pathologic cohort study.
It focuses on aging and Alzheimer's disease (AD).

Purpose of the Study:

To summarize the study's methods, design, and data collection.
To present findings on neuropathologic indices, risk factors, and clinical outcomes in aging and AD.

Main Methods:

Longitudinal clinical-pathologic cohort design.
Clinical evaluation and risk factor assessment.
Collection of ante-mortem biological specimens and postmortem brain data.

Main Results:

Review of neuropathologic indices relation to clinical diagnoses and cognition near death.
Examination of risk factors' relation to clinical outcomes and neuropathology.
Summary of additional study findings and contextualization.

Conclusions:

The study provides comprehensive data on aging and Alzheimer's disease.
Findings contribute to understanding the interplay of risk factors, pathology, and clinical presentation in AD.