https://data.mrc.ox.ac.uk/data-set/effects-hunger-model-based-and-model-free-decision-making

Effects of hunger on model-based and model-free decision-making


van Swieten MMHManohar SGBogacz R

In this study, healthy participants were tested on the effects of hunger on model-free and model-based decision-making. Each first-stage choice rocket was predominantly associated with one of the second-stage planets (common transition: 70% of the trials) and sometimes with the other second-stage planet (rare transition: 30% of the trials). Each second-stage alien probabilistically lead to a reward. The reward probabilities for each second-stage alien fluctuated across trials between 25% and 75% according to a Gaussian random walk.
Data Two Step (excel file) contains the following fields:

Sheet 1: Behavioural data 
Subject:			Number of participant
Condition:			Hunger (1) or Sated (2)
Trial: 				Trial number
Block:				Block number 1-4
Choice stage 1:			Left (1) or right (2)
RT stage 1:			reaction time at stage 1 in ms
Stage 2 state:			indicated the second stage planet
Transition type: 		common (1) or rare (0)
Choice stage 2:			Left (1) or right (2)
RT stage 2:			reaction time at stage 2 in ms
Reward:				rewarded (1) or unrewarded (0)
Total Reward:			Running total number of points
Stim order stage 1:		[1,2] or [2,1] indicates whether the stimulus 1 or stimulus 2 was presented on the left or right.
Stim order stage 2:		1,2] or [2,1] indicates whether the stimulus 1 or stimulus 2 was presented on the left or right.
Reward probabilities:		Reward probabilities of the second stage planet (S1 or S2) and alien (A1 or A2)

Sheet 2: Study details
Subject: 			number of participant
Session 1: 			hunger (1) or sated (2)
Session 2: 			hunger (1) or sated (2)
Age: 				age of participant
Gender: 			male (1) or female (2)
Height: 			height in m
Weight: 			weights in kg
Highest level of education
BMI: 				BMI of participant in kg/m2

Sheet 3: Processed data
Subject:			Number of participant
Condition:			Hunger (1) or Sated (2)
CR: 				Stay probability for Common-rewarded trials
RR:				Stay probability for Rare-rewarded trials
CU:				Stay probability for Common-unrewarded trials
RU:				Stay probability for Rare-Unrewarded trials
MB_index: 			Index for model-based behaviour
MF_index:			Index for model-free behaviour
Missed trials:			Number of missed trials per session
TotalPoints: 			Total number of points earned
MedianRT stage 1: 		Median reaction time for stage 1 (ms)
MedianRT stage 2: 		Median reaction time for stage 2 (ms)

Sheet 4: Parameters Gaussian
Subject:			Number of participant
Condition:			Hunger (1) or Sated (2)
bMB:				Gaussian distributed model-based weighting parameter
bMF:				Gaussian distributed model-free weighting parameter
b_2:				Gaussian distributed softmax parameter for stage 2
a_1:				Gaussian distributed learning rate parameter for stage 1
a_2:				Gaussian distributed learning rate parameter for stage 2
a_21:				Gaussian distributed learning rate parameter for eligibility traces
p:				Gaussian distributed perseverance parameter	

Sheet 5: Parameters transformed
Subject:			Number of participant
Condition:			Hunger (1) or Sated (2)
beta_MB:			Transformed model-based weighting parameter
beta_MF:			Transformed model-free weighting parameter
Beta_2:				Transformed softmax parameter for stage 2
alpha_1:			Transformed learning rate parameter for stage 1
alpha_2:			Transformed learning rate parameter for stage 2
alpha_21:			Transformed learning rate parameter for eligibility traces
pi:				Transformed perseverance parameter	

PlotFigures (matlab file):
Plots the results figures used in the paper