Perception & Action Lab: Guidance Hypothesis
Testing the Guidance Hypothesis by Molly King on Prezi
The task involved a self-paced, blind aiming movement to a target that was located 80 mm from a predefined start location. The movement direction was away from the midline of the body (sternum) in the sagittal plane. Participants used their nondominant hand to perform the movement, and they were told to complete the movement with one smooth, continuous motion. All movements were made with a penshaped stylus that could be moved freely to the target location on an electronic CalComp (GTCO CalComp, Inc., Columbia, MD) Drawing Board II, Model 33180. A thin piece of rubber tubing (spring) that was attached to the table on which the drawing board was located was fixed to the stylus. The spring had a pull of approximately 0 g at the start location and 575 g at the target location. The spring was linear within the range of movements made by participants, and repeated testing revealed that its characteristics did not change across the experiment. The endpoint location of each movement was recorded by the drawing board and relayed directly to an IBM PC computer. A 30-cm-high table was placed above the drawing board, and the participant was positioned such that the table was directly below his or her chin. The table served two purposes: It occluded vision of the whole arm and the drawing board, and it supported an IBM color monitor that was placed directly in front of the participants’ field of vision, approximately 1 m away. The computer controlled the entire experiment.
29/11/2012 · Testing the Guidance Hypothesis: ..
Many researchers have questioned the validity of Asperger's syndrome as a distinct diagnostic entity apart from autism (Semrud-Clikeman & Hynd, 1990; Wing, 1991).
reject the null hypothesis that the two groups ..
Thus, psychological tools are not invented by the individualin isolation. They are products of sociocultural evolution towhich individuals have access by being actively engaged in thepractices of their communities. In a recent article, Wertsch (1994)elaborates on the centrality of mediation in understanding Vygotsky'scontributions to psychology and education.
The somatic-marker hypothesis: how decision are made …
The intrinsic feedback sources were identified from semistructured post hoc interviews of participants who had performed the same task in the Anderson et al. () experiment. In the present experiment, the participants checked the sources of intrinsic feedback on a sheet of paper and then wrote their answer to the second question on the same sheet. That procedure usually took less than 5 min. It must be acknowledged that one cannot determine the reliability of participants’ answers when the questions are asked only at the end of the experiment. However, that limitation was deemed acceptable relative to the more serious threat to the validity of the study that would have occurred had we also asked the learners about their intrinsic feedback usage during acquisition or before the retention trials. In other words, there was a high probability of biasing the learner’s attention to certain sources of intrinsic feedback or modifying the way in which they used intrinsic feedback, once we had asked our questions. With respect to internal validity, it must also be acknowledged that there was no way to independently verify that participants actually noticed and used the sources of intrinsic feedback that they reported to the experimenter.