Cognative treatments

Major Depresive Disoder (MDD) is mood disoder that is characerized as persistent low moods . diagnosis via the DSM-5 states that paitents needs to have at least 5 symptoms such as constant low mood, loss of ability to feel pleasure from pleasurbale experience, intense feelings of sadness and guilt, apathy, lack of sleep of oversleeping, over or under eating

Cognitive Behavioral Therapy

the percentage of individuals who experience a return of symptom

talk therapy that treats mental health issues by changing negative thought patterns and behaviors through Cognitive restructuring, behavioral activation and homework tasks.

Hollon et al 2005

To identify relapse rates in patients dependent on treatment.

USed patients with moderate to severe depression

Participants were randomly assigned to one of three treatment groups:
CBT
Antidepressant medication (paroxetine)
Placebo treatment
Treatment phase
The treatment lasted 16 weeks.
Depression symptoms were measured regularly using standardized clinical depression scales.
Follow-up phase
Participants who recovered were followed for 12 months after treatment.
Researchers measured relapse rates.

Patients withdrawn from CBT (30.8%) were less likely to relapse than patients withdrawn from medications (76.2%)

Effect of CBT extends to the prevention of recurrence

CBT is effective in treating MDD in the long term.

T: The study uses a controled experimental design which has a defined IV (Type of treatment) and DV (relaspes rates over time. Relapse were also operationalized by using a standardized depression diagnostic criteria (17-item Hamilton Rating Scale for Depression (HRSD)). However, relapse is influenced by many external factors (life, stress, supporrt systems) which are difficult to control, reudcing full testability

A: The study's focus on the long-term effects of cognitive therapy - examining sustainability and enduring benefits post-treatment. This insight is crucial for healthcare policy and treatment planning, providing evidence that could support the use of cognitive therapy for lasting impact in treating depression. However partipents were USA based and were treated in controlled clinical setting as a result it limits the studies global generzability and ecological validity as treatment adherence varies in a real-world context and different countries and cultures treat mental health differently.

P: high predictability by showing a consistent pattern in long-term outcomes: patients treated with antidepressant medication tend to show higher relapse rates after treatment, whereas those treated with CBT show lower relapse rates. This allows researchers to predict that CBT is more likely to produce more sustained recovery, while medication alone may be more effective in the short term but less stable over time. However, predictability is not perfect, as individual differences such as severity of depression, personality, and environmental factors mean that relapse outcomes cannot be accurately predicted for every patient.

While Hollon et al. relapse study demonstrates the long-term effectiveness of CBT in reducing relapse, Elkin et al. (1989) examines how effective CBT is compared to other treatments during the initial stages of depression.

Elkin et al (1989)

interpersonal therapy - focuses on relieving symptoms by improving interpersonal functioning

To compare the effectiveness of different treatments for depression — cognitive-behavioral therapy (CBT), interpersonal therapy (IPT), and antidepressant medication (imipramine) — against a placebo control.

Controlled experimental design
Around 280 adults diagnosed with major depressive disorder participated.
Therapist used 28 - 8 in CBT, 10 in each IPT and drug treatment
Participants were randomly assigned to one of four groups: CBT, IPT, imipramine + clinical management, or placebo + clinical management.
Treatment lasted 16 weeks, and depression levels were measured before, during, and after treatment using standardized rating scales (e.g., Hamilton Depression Rating Scale).

to standerdized depression rating scale (Hamilton Rating Scale for Depression (HRSD))
- no difference between cbt and ipt
- all three had equivalent degrees of success and superior to placebo
- placebo+clinincal showed no improvement
- in favor of cbt and ipt in severe cases

CBT Is an effective treatment for MDD in acute phase of depression however if a paitent has a more severe case of MDD than cognative treatments are less effective compared to drug treatments

T: High testability as it experimental design with clearly defined variables; independent variable: type of treatment (CBT, IPT, medication, placebo) and dependent variable: levels of depression symptoms, thus strengthening internal validity. The standardized procedures (e.g using the HRSD) and treatment protocols allow replication. However, therapy outcome can still be influenced by external variables (therapist skill, patient motivation), which are difficult to fully control.

A: The findings of real-world application, as they directly inform clinical conditions about which treatments to use for depression. However, as the study was done in a structured clinical environment, the results may not fully generalize to the everyday therapy environment, thus limiting external validity

C: relattivly high construct validity because depression is measured by using the HRSD, standardized diagnostic criteria and validated scales. However, depression is a complex and subjective experience, and reducing it to numerical scores may oversimplify the construct.

U: study attempts to limit bias through random allocation, use of placebo control and standerdized treatment protcals which stregnthen internal validity. However, Therapist effects (the varibality in patient outcomes that can be attributed specifically to the practiition(therapist)) may influence outcomes in CBT/IPT.

While both studies suggest that cognitive treatments are an effective approach to treating Major Depressive Disorder, Hollon et al. (2005) relapse study highlights the long-term benefits of CBT in reducing relapse rates, whereas Elkin et al. (1989) provides a broader comparison of treatment effectiveness, showing that CBT is as effective as biological and other psychological treatments during the acute phase of depression. However, treatment effectiveness may vary depending on severity and individual differences.