Brain and Behavior

Exam Preparation Tips

First exam on: February 3rd
In-class exam format: No Scantrons; students write directly on exam papers which allows for handwritten notes and outlines. This method can personalize responses but requires clarity in handwriting.

Last-Minute Cramming: Write down key concepts, terms, and formulas just before the exam to trigger memory recall. Visual aids like diagrams or charts can further enhance retention.
Managing Anxiety: Approach exams as opportunities to demonstrate knowledge rather than threats. Use relaxation techniques. Deep breathing can shift focus and calm nerves. Visualize success to boost confidence.
Self-Assessment: Remember that exams measure understanding, not worth. Reflect on previous learning experiences to gain perspective and reduce pressure.

Distinction between laboratory and naturalistic testing methods:
- Laboratory Settings: Provide a controlled environment to isolate variables. However, they may lead to observer effects where participants perform differently under observation.
- Naturalistic Settings: Allow for observation of genuine behavior in everyday contexts, yet these settings come with challenges like uncontrolled variables (weather, noise) that impact results.

Skin Conductance & EEG: Measures physiological arousal via electrical activity in the skin and brain.
Detection of Arousal: Higher electrical frequencies in EEG indicate increased arousal levels. However, these methods have limitations: they cannot definitively indicate lying, and individual responses to anxiety vary widely.

Focuses on understanding the causal relationships between brain structures and behaviors.
Typically investigates behaviors post brain damage—either accidental or surgical.
Challenges: Difficulties arise due to uneven damage across brain regions leading to inconclusive results. Furthermore, ethical complications relate to conducting research where participants must be adequately able to give consent.

Techniques that visualize brain activity to understand cognition and behavior in real-time.
Blood Flow and Activation: Neuroimaging assumes that increased blood flow correlates with brain activation during specific tasks.
Main Techniques:
- fMRI (Functional Magnetic Resonance Imaging): Dominant method in neuroscience; measures changes in blood oxygen levels, providing insights into brain activity patterns.
- PET (Positron Emission Tomography): Uses radioactive substances to provide both spatial and temporal data but poses health risks due to radiation exposure.
- MEG (Magnetoencephalography): Offers superior spatial and temporal resolution compared to fMRI and PET but is prohibitively expensive and complex to conduct.

An emerging, non-invasive treatment targeting depression by utilizing magnetic fields to stimulate specific brain areas.
Aims to restore balance between hyperactive emotional responses (controlled by the limbic system) and underactive cognitive inhibition (managed by the prefrontal cortex).
Particularly effective in treatment-resistant cases, it shows potential for alleviating chronic pain as well.

Highlights the significance of Institutional Review Boards (IRBs) established to prevent unethical practices in psychological research.
Notable unethical studies comprise:
- Schizophrenia Study: Participants were removed from their medication against ethical guidelines.
- Milgram Experiment: Explored obedience to authority, causing significant distress to participants.
- Little Albert Experiment: Demonstrated fear conditioning when exposing a child to stimuli in unethical circumstances.
- Tuskegee Syphilis Study: Exploited vulnerable populations without informed consent and caused harm.
Role of IRBs: Ensure research maintains ethical standards and seeks to minimize potential harm towards participants.

Neurons consist of several key components:
- Dendrites: Act as the input terminals receiving signals from other neurons.
- Cell Body (Soma): Contains the nucleus and integrates signals received by dendrites.
- Axon: Carries impulses away from the cell body toward other neurons.
Myelin Sheath: Fatty layer covering axons, enhancing transmission speed of electrical signals, interspersed with nodes of Ranvier allowing rapid signal conduction.

Involves the generation of an electrical charge that travels along the axon. When sufficient stimuli act on dendrites, the neuron reaches the action potential threshold, triggering the impulse.
All or Nothing Principle: Action potentials are either fully triggered or not at all, maintaining consistent intensity once initiated.

In their resting state, neurons are polarized, providing a negative internal charge relative to the external environment.
Voltage-Gated Ion Channels: Sodium and potassium channels open depending on changes in membrane voltage, facilitating action potential generation and propagation.

Neurons form the complex nervous system enabling communication throughout the body, essential for cognition, perception, and all forms of behavior regulation.