diff --git a/src/aind_behavior_dynamic_foraging/task_logic/utils/calculate_bias.py b/src/aind_behavior_dynamic_foraging/task_logic/utils/calculate_bias.py
index 3442641..32965c1 100644
--- a/src/aind_behavior_dynamic_foraging/task_logic/utils/calculate_bias.py
+++ b/src/aind_behavior_dynamic_foraging/task_logic/utils/calculate_bias.py
@@ -67,12 +67,12 @@ def calculate_bias(outcomes: List[TrialOutcome]) -> float:
         logger.warning("No choices in the last %d trials. Returning bias of 0.", trial_window_length)
         return 0
     if n_right_choice == 0:
-        logger.warning("No right choices in the last %d trials. Returning bias of -1.", trial_window_length)
-        return -1
+        logger.warning("No right choices in the last %d trials. Returning bias of +1.", trial_window_length)
+        return 1
 
     if n_left_choice == 0:
-        logger.warning("No left choices in the last %d trials. Returning bias of +1.", trial_window_length)
-        return 1
+        logger.warning("No left choices in the last %d trials. Returning bias of -1.", trial_window_length)
+        return -1
 
     logistic_reg = LogisticRegression(solver=solver, l1_ratio=l1_ratio, C=1 / regularization_strength)
     logistic_reg.fit(x, y)
diff --git a/tests/trial_generators/test_calculate_bias.py b/tests/trial_generators/test_calculate_bias.py
index 528a834..1cf6ca2 100644
--- a/tests/trial_generators/test_calculate_bias.py
+++ b/tests/trial_generators/test_calculate_bias.py
@@ -42,7 +42,7 @@ def test_uniform_choices_returns_nan(self):
         """All same choice and reward should return nan since bias is undefined."""
         outcomes = make_outcomes(100, 1, 1)
         bias = calculate_bias(outcomes)
-        self.assertTrue(bias == 1)
+        self.assertTrue(bias == -1)
 
     def test_ignored_trials_excluded(self):
         """Adding ignored trials should not change the result."""