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Physiology and Cognition (PAC)

Metabolism is the process your body uses to make energy from the food you eat. The purpose of this study is to observe the impact of metabolism on cognition and behavior.

Age & Gender

  • 18 years ~ 99 years
  • Male, Female, Gender Inclusive

Visit Availability

  • Standard business hours (M-F, 8-5)
  • Extended hours (M-F, early morning or evening)


North Carolina (Statewide)

What will be asked of you

This study has 3 parts: (1) a 1-hour in-person session, (2) a week of daily surveys, and (3) a final two-hour in-person session. After completing our pre-screening survey, participants are asked to come into the lab for a 1-hour session. During this session they will complete questionnaires and tasks. Questionnaires will ask about physical and mental health, life experiences, emotions and cognitive associations. Tasks are designed to measure participants' sensitivity to heartbeat and stomach sensations. Next, participants will complete short surveys delivered via SMS or email 3 times (at 10:00 AM, 3:00 PM, and 8:00 PM) a day for 7 days. Most of these surveys will take 2-3 minutes to complete. Questions will ask about present emotion, body sensations, social preferences, hunger, and food intake. On three days, participants will receive a longer evening survey where they will be asked to recall what food they ate during the day. Finally, participants will be asked to complete a 12-hour fast before returning to the lab for a final 2-hour session. During this session they will complete several questionnaires and tasks. Questionnaires will ask about physical and body sensations. Participants will also be asked to complete a blood draw. Participants will be asked to complete 6 short tasks assessing cognitive and socioemotional functioning.


$45, Participants will receive a nutrition report using information collected during experience sampling. Nutrition reports provide participants with feedback on how their reported intake compares to country-specific dietary guidance for calorie, food group, and nutrient intake.

In-person visits:
Phone or online visits:
Total length of participation:
About 4.5 hours spread over 2 weeks.

Looking for Healthy Volunteers

Requirements for healthy volunteers are different than for those with a specific condition. If you are interested in becoming a healthy volunteer for this study, use the below categories to determine if you are able to participate.

Able to participate:

  • You are 18+ years old.
  • You are a fluent English speaker.
  • You have normal or corrected to normal vision.
  • You have normal or corrected to normal hearing.

Not eligible if:

  • Have been diagnosed with a condition effecting autonomic, endocrine, or metabolic function.
  • You take medications that alter autonomic, endocrine, or metabolic function.
  • You are currently participating in a weight-loss program.
  • You feel lightheaded, faint, anxious, or sick to your stomach at the sight of blood.
  • You are pregnant or may be pregnant.

Contact the Team

Visit Location

Contact & Visit Location

Primary Contact

Primary Visit Location

Davie Hall (UNC-Chapel Hill)
235 E Cameron Ave, Chapel Hill, NC 27514, USA

Additional Study Information

Principal Investigator

Mallory Feldman
Psychology and Neuroscience

Study Type

Behavioral or Social

Study Topics

Stomach, Digestion and Gut Health
Eating, Nutrition, and Metabolism
Healthy Volunteer or General Population
Mental and Emotional Health
Opinions and Perceptions
Wellness and Lifestyle
UNC Students (undergrad, grad, professional)

IRB Number


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