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The electrophysiological ( McIlwain , 1982 ; Munoz and Istvan , 1998 ) and pharmacophysiological ( Meredith and Ramoa , 1998 ; Pettit et al ., 1999 ) experiments that provide credence for such connectivity monitored extracellular activity while stimulation pulses were delivered to different parts of the collicular map . For example , if another car is following too closely and you need to brake , you can lightly pump the brake pedal to cause the brake light to flash repeatedly , thereby increasing the chances that the driver behind you will notice that you are stopping . She typed in her home address and current location on Mapquest.com , and got some directions back to her house . The image appears similar to the 1 / f noise pattern shown in B. E , The natural image shown in C , but with a whitened power spectrum and a normal phase spectrum . It extends several recent models ( see especially Fukushima , 1980 ; see also Perrett and Oram , 1993 ; Poggio and Edelman , 1990 ; Riesenhuber and Poggio , 1999b ; Wallis and Rolls , 1997 ) . It was soon found that while some of these neurons could respond to parts of faces , other neurons required several parts of the face to be present in the correct spatial arrangement , and that many of these neurons did not just respond to any face that was shown , but responded differently to different faces ( Desimone et al ., 1984 ; Gross et al ., 1985 ; Perrett et al ., 1982 ; Rolls , 1984 ) .