diff --git a/brain/src/brain.cpp b/brain/src/brain.cpp
index 7625cb4..73af15d 100644
--- a/brain/src/brain.cpp
+++ b/brain/src/brain.cpp
@@ -228,6 +228,7 @@ u32 brain::rev_search(const block &target, const search_params &params) {
   return furthest_index;
 }
 
+/*
 // really slow - every to every comparison of blocks calculating average distance
 double brain::calc_average_diff(search_params &params) {
   double diff=0;
@@ -261,6 +262,7 @@ void brain::build_synapses_thresh(search_params &params, double thresh) {
     ++outer_index;
   }  
 }
+*/
 
 void brain::build_synapses_fixed(search_params &params) {
   //m_average_error = calc_average_diff(params)*thresh;
diff --git a/brain/src/brain.h b/brain/src/brain.h
index f7dc1e4..6b11bfa 100644
--- a/brain/src/brain.h
+++ b/brain/src/brain.h
@@ -62,8 +62,8 @@ public:
     u32 rev_search(const block &target, const search_params &params);
 
     // synaptic search
-    double calc_average_diff(search_params &params);
-    void build_synapses_thresh(search_params &params, double threshold);
+    // double calc_average_diff(search_params &params);
+    // void build_synapses_thresh(search_params &params, double threshold);
     void build_synapses_fixed(search_params &params);
     u32 search_synapses(const block &target, search_params &params);
     double get_current_error() { return m_current_error; }