diff --git a/linear_relational/ConceptMatcher.py b/linear_relational/ConceptMatcher.py
index 7a405f2..ebbbe81 100644
--- a/linear_relational/ConceptMatcher.py
+++ b/linear_relational/ConceptMatcher.py
@@ -6,7 +6,10 @@
 from torch import nn
 
 from linear_relational.Concept import Concept
-from linear_relational.lib.extract_token_activations import extract_token_activations
+from linear_relational.lib.extract_token_activations import (
+    TokenLayerActivationsList,
+    extract_token_activations,
+)
 from linear_relational.lib.layer_matching import (
     LayerMatcher,
     collect_matching_layers,
@@ -52,6 +55,9 @@ class ConceptMatcher:
     tokenizer: Tokenizer
     layer_matcher: LayerMatcher
     layer_name_to_num: dict[str, int]
+    map_activations_fn: (
+        Callable[[TokenLayerActivationsList], TokenLayerActivationsList] | None
+    )
 
     def __init__(
         self,
@@ -59,11 +65,15 @@ def __init__(
         tokenizer: Tokenizer,
         concepts: list[Concept],
         layer_matcher: Optional[LayerMatcher] = None,
+        map_activations_fn: (
+            Callable[[TokenLayerActivationsList], TokenLayerActivationsList] | None
+        ) = None,
     ) -> None:
         self.concepts = concepts
         self.model = model
         self.tokenizer = tokenizer
         self.layer_matcher = layer_matcher or guess_hidden_layer_matcher(model)
+        self.map_activations_fn = map_activations_fn
         ensure_tokenizer_has_pad_token(tokenizer)
         num_layers = len(collect_matching_layers(self.model, self.layer_matcher))
         self.layer_name_to_num = {}
@@ -100,6 +110,10 @@ def _query_batch(self, queries: Sequence[ConceptMatchQuery]) -> list[QueryResult
                 batch_size=len(queries),
                 show_progress=False,
             )
+            if self.map_activations_fn is not None:
+                batch_subj_token_activations = self.map_activations_fn(
+                    batch_subj_token_activations
+                )
 
         results: list[QueryResult] = []
         for raw_subj_token_activations in batch_subj_token_activations:
diff --git a/linear_relational/lib/extract_token_activations.py b/linear_relational/lib/extract_token_activations.py
index a0e455c..e8b1083 100644
--- a/linear_relational/lib/extract_token_activations.py
+++ b/linear_relational/lib/extract_token_activations.py
@@ -11,6 +11,8 @@
 from .TraceLayerDict import TraceLayerDict
 from .util import batchify, tuplify
 
+TokenLayerActivationsList = list[OrderedDict[str, list[torch.Tensor]]]
+
 
 def extract_token_activations(
     model: nn.Module,
@@ -22,12 +24,12 @@ def extract_token_activations(
     move_results_to_cpu: bool = True,
     batch_size: int = 32,
     show_progress: bool = False,
-) -> list[OrderedDict[str, list[torch.Tensor]]]:
+) -> TokenLayerActivationsList:
     if len(texts) != len(token_indices):
         raise ValueError(
             f"Expected {len(texts)} texts to match {len(token_indices)} subject token indices"
         )
-    results: list[OrderedDict[str, list[torch.Tensor]]] = []
+    results: TokenLayerActivationsList = []
     for batch in batchify(
         # need to turn the zip into a list or mypy complains
         list(zip(texts, token_indices)),
diff --git a/tests/helpers.py b/tests/helpers.py
index 8c9026c..764b8da 100644
--- a/tests/helpers.py
+++ b/tests/helpers.py
@@ -43,3 +43,7 @@ def quick_concept(
         vector=concept_vec,
         layer=layer,
     )
+
+
+def normalize(vec: torch.Tensor) -> torch.Tensor:
+    return vec / vec.norm()
diff --git a/tests/test_ConceptMatcher.py b/tests/test_ConceptMatcher.py
index 7c1ecd4..3bf6432 100644
--- a/tests/test_ConceptMatcher.py
+++ b/tests/test_ConceptMatcher.py
@@ -1,8 +1,13 @@
+from collections import OrderedDict
+
+import pytest
 import torch
 from transformers import GPT2LMHeadModel, GPT2TokenizerFast
 
 from linear_relational.Concept import Concept
 from linear_relational.ConceptMatcher import ConceptMatcher, ConceptMatchQuery
+from linear_relational.lib.extract_token_activations import TokenLayerActivationsList
+from tests.helpers import normalize
 
 
 def test_ConceptMatcher_query(
@@ -44,3 +49,54 @@ def test_ConceptMatcher_query_bulk(
     assert len(results) == 2
     for result in results:
         assert concept.name in result.concept_results
+
+
+def test_ConceptMatcher_query_bulk_with_map_activations_fn(
+    model: GPT2LMHeadModel, tokenizer: GPT2TokenizerFast
+) -> None:
+    concept_vec = normalize(torch.randn(768))
+    concept1 = Concept(
+        object="test_object1",
+        relation="test_relation",
+        layer=10,
+        vector=concept_vec,
+    )
+    concept2 = Concept(
+        object="test_object2",
+        relation="test_relation",
+        layer=10,
+        vector=-1 * concept_vec,
+    )
+
+    def map_activations(
+        token_layer_acts: TokenLayerActivationsList,
+    ) -> TokenLayerActivationsList:
+        mapped_token_layer_acts: TokenLayerActivationsList = []
+        for token_layer_act in token_layer_acts:
+            mapped_token_layer_act = OrderedDict()
+            for layer, acts in token_layer_act.items():
+                mapped_token_layer_act[layer] = [concept_vec for act in acts]
+            mapped_token_layer_acts.append(mapped_token_layer_act)
+        return mapped_token_layer_acts
+
+    conceptifier = ConceptMatcher(
+        model,
+        tokenizer,
+        [concept1, concept2],
+        layer_matcher="transformer.h.{num}",
+        map_activations_fn=map_activations,
+    )
+    results = conceptifier.query_bulk(
+        [
+            ConceptMatchQuery("This is a test", "test"),
+            ConceptMatchQuery("This is another test", "test"),
+        ]
+    )
+    assert len(results) == 2
+    for result in results:
+        assert result.concept_results[
+            "test_relation: test_object1"
+        ].score == pytest.approx(1.0)
+        assert result.concept_results[
+            "test_relation: test_object2"
+        ].score == pytest.approx(-1.0)