The PANAS Scale: Measuring Positive and Negative Affect

How do you measure something as subjective as a mood? This question has occupied psychologists for decades, and one of the most successful answers came in 1988 when David Watson, Lee Anna Clark, and Auke Tellegen published their Positive and Negative Affect Schedule (PANAS) in the Journal of Personality and Social Psychology. Nearly four decades later, the PANAS remains one of the most cited and widely used mood measurement instruments in psychological research.

What Is the PANAS?

The PANAS is a self-report questionnaire consisting of 20 items — 10 measuring Positive Affect (PA) and 10 measuring Negative Affect (NA). Respondents rate each item on a 5-point Likert scale from 1 (“very slightly or not at all”) to 5 (“extremely”), indicating the extent to which they have experienced each feeling within a specified time frame.

Positive Affect Items

The 10 PA descriptors are: interested, excited, strong, enthusiastic, proud, alert, inspired, determined, attentive, and active.

Negative Affect Items

The 10 NA descriptors are: distressed, upset, guilty, scared, hostile, irritable, ashamed, nervous, jittery, and afraid.

Each scale yields a score ranging from 10 to 50. Importantly, PA and NA are not opposite ends of a single continuum — they are independent dimensions. A person can score high on both (feeling excited but also nervous before a presentation), low on both (feeling flat and disengaged), or any combination.

The Two-Factor Model of Affect

The PANAS is grounded in Watson and Tellegen’s two-factor model of affect, published in Psychological Bulletin in 1985. Through factor analysis of numerous mood studies, they demonstrated that the structure of self-reported mood consistently resolves into two broad, largely independent dimensions:

• Positive Affect reflects the extent to which a person feels enthusiastic, active, and engaged. High PA is a state of full concentration, pleasurable engagement, and energy. Low PA is characterized by sadness and lethargy.

• Negative Affect reflects subjective distress and unpleasurable engagement. High NA includes anger, contempt, disgust, guilt, fear, and nervousness. Low NA is a state of calmness and serenity.

This independence is a critical insight. In everyday language, we tend to think of “happy” and “sad” as opposites. But the empirical data shows they operate as separate systems. Research by Watson and colleagues using daily mood diaries found that PA and NA fluctuate independently over time — a bad day at work (high NA) doesn’t necessarily eliminate feelings of enthusiasm about an evening hobby (high PA).

Psychometric Properties

The PANAS has excellent psychometric credentials, which explains its enduring popularity:

• Internal consistency: Cronbach’s alpha values typically range from .86 to .90 for PA and .84 to .87 for NA, indicating strong reliability.
• Test-retest reliability: Stability coefficients vary by time instruction. For trait-level measures (“in general”), 8-week test-retest correlations are .68 for PA and .71 for NA. For momentary assessments (“right now”), reliability is naturally lower, reflecting genuine mood fluctuations.
• Convergent and discriminant validity: PA correlates strongly with measures of well-being and extroversion, while NA correlates with measures of distress, neuroticism, and psychopathology — each showing appropriate discriminant independence from the other dimension.

The original 1988 paper has been cited over 40,000 times according to Google Scholar, making it one of the most referenced papers in affective science.

Time Instructions and Flexibility

One of the PANAS’s practical strengths is its flexibility in temporal framing. The same 20 items can be administered with different time instructions:

• “Right now” — captures momentary mood (state measure)
• “Today” — daily mood assessment
• “Past few days” or “Past week” — short-term mood
• “Past few weeks” or “Past year” — longer-term affect
• “In general” — trait-level dispositional affect

This flexibility makes the PANAS suitable for everything from ecological momentary assessment studies (multiple daily measurements) to large-scale personality research (single administration).

Applications in Research

The PANAS has been used in thousands of studies across diverse domains:

Clinical Psychology

NA scores are elevated in anxiety and depressive disorders. Watson’s influential tripartite model (1991), developed with Lee Anna Clark, proposed that high NA is shared by both anxiety and depression, while low PA is specific to depression and physiological hyperarousal is specific to anxiety. This model helped explain the high comorbidity between anxiety and depression while identifying what distinguishes them.

Health Psychology

Research by Sarah Pressman and Sheldon Cohen, published in Psychosomatic Medicine (2005), used PANAS-derived measures to show that positive affect is associated with better immune function and lower susceptibility to illness, independent of negative affect levels.

Organizational Psychology

PA measured by the PANAS predicts job satisfaction, creativity, and prosocial workplace behavior. A study by Staw, Sutton, and Pelled (1994) in Administrative Science Quarterly found that employees’ PA predicted supervisor ratings of work performance.

Daily Diary Studies

The PANAS is particularly well-suited to experience sampling methods. Researchers like Randy Larsen and Ed Diener have used daily PANAS administrations to study mood variability, emotional reactivity, and the time course of emotional recovery from stressful events.

The PANAS-X and Expanded Versions

Watson and Clark extended the original PANAS into the PANAS-X (1994), which includes 60 items measuring 11 specific affects beyond the two broad dimensions:

• Positive: joviality, self-assurance, attentiveness
• Negative: fear, hostility, guilt, sadness
• Other: shyness, fatigue, serenity, surprise

The PANAS-X provides more granular emotional measurement while preserving the higher-order PA/NA structure. An international version, the I-PANAS-SF (Thompson, 2007), offers a 10-item short form validated across 100+ countries.

Criticisms and Limitations

Despite its widespread use, the PANAS has received several critiques:

Content Coverage

Some researchers argue that the PA items emphasize high-arousal positive states (excited, enthusiastic) at the expense of low-arousal positive states (calm, relaxed, content). This reflects a deliberate design choice tied to Watson and Tellegen’s two-factor model, which maps PA onto a high-activation dimension. However, it means the PANAS may underrepresent the full range of positive emotional experience.

Cultural Considerations

Research by Jochen Ren and colleagues has explored whether the two-factor structure holds across cultures. While the basic PA/NA distinction is generally robust, the specific items that load on each factor can vary. East Asian populations, for instance, may show less differentiation between high- and low-arousal positive states.

Independence of PA and NA

While PA and NA are substantially independent at the between-person level, within-person daily diary data sometimes shows a moderate negative correlation — when one goes up, the other tends to go down. The degree of independence may depend on the time frame and measurement context.

The PANAS and Digital Mood Tracking

The PANAS has directly influenced the design of digital mood tracking tools. Many apps that ask users to rate their emotional state draw on PANAS-derived item lists or its underlying dimensional structure. The scale’s flexibility in time instructions maps naturally onto the varied check-in schedules that mood tracking apps offer.

Several features make the PANAS particularly compatible with digital implementation:

• Brevity: 20 items can be completed in 2-3 minutes, suitable for mobile check-ins
• Simplicity: The 5-point rating scale is intuitive on touch screens
• Dimensional scoring: PA and NA scores can be tracked over time as trend lines
• Research comparability: Using PANAS-based measures allows users to compare their scores against published norms

Population Norms

Watson and Clark’s original data provide reference points. In a sample of college students:

• PA mean: approximately 33.3 (SD = 7.2) for the “past few weeks” time frame
• NA mean: approximately 19.5 (SD = 7.0) for the same time frame

These norms vary by age and gender. Older adults tend to report slightly lower NA. Women report slightly higher NA than men in most studies, though effect sizes are small.

Key Takeaways

• The PANAS measures two independent mood dimensions — Positive Affect and Negative Affect — using 20 brief self-report items.
• Developed by Watson, Clark, and Tellegen (1988), it remains one of the most validated and widely used mood measures in psychology.
• PA and NA are not opposites: you can experience both simultaneously, and they relate to different outcomes.
• The scale’s flexibility, brevity, and strong psychometrics make it well-suited for digital mood tracking applications.
• Understanding the PANAS framework helps you interpret your own mood patterns with greater nuance — recognizing that building positive experiences and reducing negative ones are separate, complementary goals.