girl stuffing two marshmallows into her mouth

chair child control delay delayed desire development discounting eating experiment fast food girl goal gratification grit grow her hurry immediate impulsive impulsivity indulgence large later learn longterm marshmallow marshmallows mouth now patience patiently performance perservere plate postpone preschool psychology punishment reinforcement resilience reward selfcontrol sitting small snack study stuffing sugar sweets table test toddler treat two value wait waiting want watch young