Fix cnt response

mne/io/cnt/cnt.py

@@ -150,7 +150,22 @@ def _update_bad_span_onset(accept_reject, onset, duration, description):
             np.array([e.KeyPad_Accept for e in my_events])
         )
 
-        description = np.array([str(e.StimType) for e in my_events])
+        # Check to see if there are any button presses
+        description = []
+        for event in my_events:
+            # Extract the 4-bit fields
+            # Upper nibble (4 bits) currently not used
+            # accept = (event.KeyPad_Accept[0] & 0xF0) >> 4
+            # Lower nibble (4 bits) keypad button press
+            keypad = event.KeyPad_Accept[0] & 0x0F
+            if str(keypad) != "0":
+                description.append("KeyPad Response" + " " + str(keypad))
+            elif event.KeyBoard != 0:
+                description.append("Keyboard Response" + " " + str(event.KeyBoard))
+            else:
+                description.append(str(event.StimType))
+
+        description = np.array(description)
 
         onset, duration, description = _update_bad_span_onset(
             accept_reject, onset / sfreq, duration, description

mne/io/cnt/tests/test_cnt.py

@@ -57,7 +57,8 @@ def test_auto_data():
     third = pytest.warns(RuntimeWarning, match="Omitted 6 annot")
     with first, second, third:
         raw = read_raw_cnt(input_fname=fname_bad_spans)
-
+    # Test that responses are read properly
+    assert "KeyPad Response 1" in raw.annotations.description
     assert raw.info["bads"] == ["F8"]
 
     with _no_parse, pytest.warns(RuntimeWarning, match="number of bytes"):