caa a22 4500 445350350 CHVBK 20180317142842.0 cr unu---uuuuu 170323e20110901xx s 000 0 eng 10.1007/s00221-011-2809-6 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2809-6 Detecting temporal reversals in human locomotion [Elektronische Daten] [Paolo Viviani, Francesca Figliozzi, Giovanna Campione, Francesco Lacquaniti] An experiment investigated the ability by human observers to detect temporal reversals in dynamic displays of human locomotion. We video-taped the lower portion of the body of actors walking at their preferred speed either in the normal, forward direction (FW) or in the backward direction (BW). The videos were presented in a random order either as recorded (N) or in reverse (R). In one session, we presented both normal and time-reversed stimuli in the original upright orientation. In a second session, the stimuli were rotated by 180° around the horizontal axis. Observers were informed that the real recorded movement was either forward or backward and were asked to decide whether or not the movement had been time-reversed prior to the presentation. Although the kinematics of forward and backward human locomotion is quite similar, the detection of temporal reversals followed a consistent pattern showing a good accuracy in condition FW-N and a reduced but still above-chance performance in condition BW-R (by design, in both conditions actors appeared to walk forward). Performance was instead at chance level in the other two conditions where the apparent direction of the movement was backward. Inverting the spatial orientation of the stimuli reduced but did not suppress the ability to detect temporal reversals in the two conditions with apparent forward direction of movement. It is argued that implicit motor competence is at least in part instrumental for extracting the subtle discriminal information from the stimuli. Springer-Verlag, 2011 Human locomotion nationallicence Time inversion nationallicence Perception nationallicence Motor competence nationallicence Biological motion nationallicence Viviani Paolo Laboratory of Neuromotor Physiology, Santa Lucia Foundation, via Ardeatina, 306, 00179, Rome, Italy aut Figliozzi Francesca Laboratory of Neuromotor Physiology, Santa Lucia Foundation, via Ardeatina, 306, 00179, Rome, Italy aut Campione Giovanna Department of Neuroscience, University of Parma, Parma, Italy aut Lacquaniti Francesco Laboratory of Neuromotor Physiology, Santa Lucia Foundation, via Ardeatina, 306, 00179, Rome, Italy aut Experimental Brain Research Springer-Verlag 214/1(2011-09-01), 93-103 0014-4819 214:1<93 2011 214 221 https://doi.org/10.1007/s00221-011-2809-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2809-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Viviani Paolo Laboratory of Neuromotor Physiology, Santa Lucia Foundation, via Ardeatina, 306, 00179, Rome, Italy aut NATIONALLICENCE 700 1- Figliozzi Francesca Laboratory of Neuromotor Physiology, Santa Lucia Foundation, via Ardeatina, 306, 00179, Rome, Italy aut NATIONALLICENCE 700 1- Campione Giovanna Department of Neuroscience, University of Parma, Parma, Italy aut NATIONALLICENCE 700 1- Lacquaniti Francesco Laboratory of Neuromotor Physiology, Santa Lucia Foundation, via Ardeatina, 306, 00179, Rome, Italy aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 214/1(2011-09-01), 93-103 0014-4819 214:1<93 2011 214 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer