Study Notes: Sleep Duration and Inhibitory Control in Adolescents

Overview of Research Study: Sleep Duration and Inhibitory Control

• Research Objective: The study investigated whether short-term sleep duration during the school week significantly affects an adolescent's ability to inhibit a response (inhibitory control).

• Target Population: Adolescents, specifically students between the ages of $15$ and $18$.

• Sample Size and Setting: The researchers recruited $156$ students from two public high schools.

• Ethics and Consent: The study followed ethical protocols by obtaining permission from parents and agreement (assent) from the participating students.

Experimental Methodology and Design

• Research Method: The study is categorized as an experiment because it utilizes random assignment to conditions and the manipulation of an independent variable (sleep duration).

• Experimental Conditions:     * Short-Sleep Condition: Families set a bedtime allowing for approximately $5$ hours of sleep before the school-day wake time.     * Long-Sleep Condition: Families set a bedtime allowing for approximately $9$ hours of sleep before the same school-day wake time.

• Randomization: Students were randomly assigned to one of the two defined sleep schedules to ensure that individual differences were distributed equally across groups.

• Duration: The prescribed sleep schedules were followed for two consecutive school nights.

• Monitoring and Recording Tools:     * Actigraphy Watches: Worn by students to provide objective data on sleep patterns.     * Nightly Check-ins: Students reported their exact bedtime and wake time manually.

Assessment of Inhibitory Control: The Go/No-Go Task

• Timing of Assessment: The task was completed on the morning following the second night of the experimental sleep schedule.

• Task Format: A computerized "go/no-go" task was utilized.

• Behavioral Requirements:     * Go Trials: Occurred frequently; students were required to press a specific key.     * No-Go Trials: Occurred infrequently; students were required to withhold their response (not press the key).

• Operational Definition of the Dependent Variable: The primary outcome measure was recorded as the percentage of no-go trials on which the student successfully withheld responding.

Statistical Results and Findings

• Mean Accuracy ($M$):     * Longer-Sleep Condition: Mean no-go accuracy was $M = 82.1\%$.     * Shorter-Sleep Condition: Mean no-go accuracy was $M = 72.9\%$.

• Standard Deviation ($SD$):     * Longer-Sleep Condition: $SD = 9.4\%$.     * Shorter-Sleep Condition: $SD = 10.6\%$.

• Statistical Significance: The results yielded a p-value of $p < .05$, indicating that the difference in accuracy between the two groups is statistica lly significant and unlikely to have occurred by chance.

• Experimental Outcome: Higher mean no-go accuracy was observed in the group that received longer sleep ($9$ hours) compared to the group that received shorter sleep ($5$ hours).

Analytical Tasks for the Argumentative Analysis Question (AAQ)

• Task A: Identify the Research Method: The clues (random assignment and manipulation of sleep hours) identify this as an Experimental Method.

• Task B: Operational Definition: Define one variable by exactly how it was measured (e.g., "Sleep duration was measured by actigraphy watches and nightly check-ins of reported bedtimes/wake times" or "Inhibitory control was measured by the percentage of no-go trials where responding was successfully withheld").

• Task C: Statistical Interpretation: Interpret the effect size and condition strength. In this case, the longer-sleep condition showed a stronger outcome ($82.1\%$ accuracy) compared to the shorter-sleep condition ($72.9\%$ accuracy).

• Task D: Ethical Guidelines: Identify a relevant guideline, such as Informed Consent, which was applied by obtaining parent permission and student agreement before participation.

• Task E: Generalizability: Address whether findings apply to a larger population. Limits to generalizability include the restricted sample (only two public high schools) and the specific age range ($15$-$18$), which may affect external validity for other age groups or geographic locations.

• Task F: Mini-CER (Claim, Evidence, Reasoning):     * Claim: The results support the psychological explanation that sleep duration influences executive function and prefrontal cortex-mediated inhibition.     * Evidence: Cite a specific result, such as the $9.2\%$ difference in mean accuracy between the $9$-hour sleep group ($82.1\%$) and the $5$-hour sleep group ($72.9\%$).     * Reasoning: Explain how the higher accuracy in the longer-sleep condition suggests that sufficient sleep supports the prefrontal cortex's ability to maintain inhibitory control over automatic responses.

Student Workflow and Scoring

• Step 1: Select Unit and AAQ/EBQ prompt.

• Step 2: Identify method clues, measurements, and key statistics.

• Step 3 (AAQ): Define variables, interpret stats, address ethics/generalizability, and complete the Mini-CER.

• Step 4 (EBQ): Make a claim, cite evidence from sources, and explain reasoning using AP Psychology concepts.

• Step 5: Utilize the automated system to score, revise, and resubmit for feedback. -