The auditory steady state response(ASSR) may reflect activity from different regions of the brain, depending on the modulation frequency used. In general, responses induced by low rates(≤40 Hz)emanate mostly from central structures of the brain, and responses from high rates(≥80 Hz) emanate mostly from the peripheral auditory nerve or brainstem structures. Besides, it was reported that the gamma band ASSR(30–90 Hz) played an important role in working memory, speech understanding and recognition. This paper investigated the 40 Hz ASSR evoked by modulated speech and reversed speech.The speech was Chinese phrase voice, and the noise-like reversed speech was obtained by temporally reversing the speech. Both auditory stimuli were modulated with a frequency of 40 Hz. Ten healthy subjects and 5 patients with hallucination symptom participated in the experiment. Results showed reduction in left auditory cortex response when healthy subjects listened to the reversed speech compared with the speech. In contrast, when the patients who experienced auditory hallucinations listened to the reversed speech, the auditory cortex of left hemispheric responded more actively. The ASSR results were consistent with the behavior results of patients. Therefore, the gamma band ASSR is expected to be helpful for rapid and objective diagnosis of hallucination in clinic.
A dual laser radar based path planning method for mobile robot in general outdoor road environment is proposed. Firstly, the point-wise sequence and target library of the global optimal path are generated based on algorithm A*. Secondly, the local target information and the perceptive information from dual laser radar are combined, and the different field information from both horizontal and aslant fixed laser radars is fused. Finally, the optimal driving angle is computed by the improved angle potential field(APF)algorithm. The practical experiment results validate the robustness and timeliness of the proposed approach.
It is very difficult to capture the target in the microgravity environment, simply by relying on ground operat...
WANG Dongli 1 , LIU Huaping 2 , SUN Fuchun 2 , DU Yonggui 1 1. Automation college of information engineering, Taiyuan university of technology, Taiyuan 030024, china2. Tsinghua national laboratory for information science and technology,state key laboratory of intelligent technology and systems,department of computer science and technology,tsinghua university,Beijing 100084,china
