Editing Face perception (section)

===Content of speech===
The process of controlling the content of speech extract has proven to be more difficult than the elimination of non facial cues in photographs.<ref name=seed />

Thus the findings of experiments that did not control this factor lead to misleading conclusions regarding the voice recognition over the face recognition.<ref name="seed" /> For example, in an experiment it was found that 40% of the time participants could easily pair the celebrity-voice with their occupation just by guessing.<ref name="Hanley 2009 830–839" /> In order to eliminate these errors, experimenters removed parts of the voice samples that could possibly give clues to the identity of the target, such as catchphrases.<ref>{{cite journal|last=Van Lancker|first=Diana|author2=Kreiman, Jody|title=Voice discrimination and recognition are separate abilities|journal=Neuropsychologia|date=January 1987|volume=25|issue=5|pages=829–834|doi=10.1016/0028-3932(87)90120-5|pmid=3431677|s2cid=15240833}}</ref> Even after controlling the voice samples as well as the face samples (using blurred faces), studies have shown that semantic information can be more accessible to retrieve when individuals are recognizing faces than voices.<ref name="Barsics & Bredart 2011">{{cite journal|last=Barsics|first=Catherine|author2=Brédart, Serge|title=Recalling episodic information about personally known faces and voices|journal=Consciousness and Cognition|date=June 2011|volume=20|issue=2|pages=303–8|doi=10.1016/j.concog.2010.03.008|pmid=20381380|s2cid=40812033}}</ref>

Another technique to control the content of the speech extracts is to present the faces and voices of personally familiar individuals, like the participant's teachers or neighbors, instead of the faces and voices of celebrities.<ref name=seed /> In this way alike words are used for the speech extracts.<ref name=seed /> For example, the familiar targets are asked to read exactly the same scripted speech for their voice extracts. The results showed again that semantic information is easier to retrieve when individuals are recognizing faces than voices.<ref name=seed />