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Thomas Jahn

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2 papers
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2

SoCS Conference 2022 Conference Paper

Benchmarks for Pathfinding Search: Iron Harvest

  • Daniel Harabor
  • Ryan Hechenberger
  • Thomas Jahn

Pathfinding is a central topic in AI for games, with many approaches having been suggested. But comparing different algorithms is tricky, because design choices stem from different practical considerations; e. g. , some pathfinding systems are grid-based, others rely on a navigation mesh or visibility graph and so on. Current benchmarks mirror this trend, focusing on one set of assumptions while ignoring the rest. In this work we present a new unified benchmark using data from the game Iron Harvest. For 35 different levels in the game we generate several complementary map representations (grid, mesh and obstacle-set) and we provide a common set of challenging instances. We describe and analyse the new benchmark and then compare several leading pathfinding algorithms that begin from different assumption sets. Our goal is to allow researchers and practitioners to better understand the relative strengths and weakness of competing techniques.

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YNIMG Journal 1999 Journal Article

Motor Dysfunction and Sensorimotor Cortex Activation Changes in Schizophrenia: A Study with Functional Magnetic Resonance Imaging

  • Johannes Schröder
  • Marco Essig
  • Klaus Baudendistel
  • Thomas Jahn
  • Ingo Gerdsen
  • Andreas Stockert
  • Lothar R. Schad
  • Michael V. Knopp

Recent studies demonstrate a diminished activation of the sensorimotor cortex and supplementary motor area (SMA) in schizophrenia which may be involved in the pathogenesis of neurological soft signs (NSS). Yet, the question whether a retarded motor performance may account for these changes remained to be clarified. Twelve DSM-III-R schizophrenics and 12 healthy controls were included. All subjects were right-handed. Nine patients received clozapine, two conventional neuroleptics, and one was drug-free. Functional magnetic resonance imaging (fMRI) was obtained in a resting condition and during pronation/supination at three speed levels (low, medium, and high) with motor performance recorded simultaneously using a pronation/supination device. While measures of motor retardation (i. e. , repetition rate and amplitude of the movements) did not differ between patients and controls, the variability of performance was significantly (P <0. 05) increased in the patients' group. In addition, patients with schizophrenia showed a significantly (P <0. 05) decreased activation of the sensorimotor cortices. Similar, although nonsignificant (P =0. 09) activation changes were observed in the SMA. Activation differences were more pronounced at a slow speed and in the drug-free patient. These results confirm a diminished sensorimotor cortex and SMA activation and indicate that variability of performance rather than retarded performance per se may correspond to these changes.

Details DOI
v2026.09.13