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Subjective significance evaluation tool, brain activity based

a sub-field and brain activity technology, applied in the field of subjective state determination, can solve the problems of large, expensive, non-mobile instruments, inability to get results within milliseconds resolution, etc., and achieve the effect of less precise results and great precision

Inactive Publication Date: 2008-04-24
TECHNION RES & DEV FOUND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020] The test stimuli, as well as the reference stimuli, can be provided through common audio-visual means such as earphones, a computer screen, a television monitor etc. The stimulus is controlled by a computer unit so that the time of delivering the stimulus is controlled with great precision. The EEG measures the responses in different brain areas mostly between 200 milliseconds (ms) and 950 ms after a stimulus is delivered.
[0021] Optionally, Peripheral arterial tonometry (PAT) recordings can be used to check peripheral autonomic response. PAT can be used instead of EEG readings, though the results are less precise.
[0022] One or more human subjects are presented with a set of subjective significant stimuli and a set on neutral stimuli. The EEG signals recorded are transformed to 3D maps of different brain parts active at a given time point after the stimulus is recei

Problems solved by technology

However, fMRI require a large and expensive and non-mobile instrumentation, and cannot get results within milliseconds resolution.

Method used

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  • Subjective significance evaluation tool, brain activity based
  • Subjective significance evaluation tool, brain activity based
  • Subjective significance evaluation tool, brain activity based

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Embodiment Construction

[0029] In the following detailed description of various embodiments, reference is made to the accompanying drawings that form a part thereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. It is understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention.

[0030] Human behavior is affected by the subjective significance of events. The present invention aims to define brain activity to subjectively significant stimuli, and characterize the time course of activity in the brain areas involved. Previous studies on the neural basis of emotions were typically fMRI or PET studies (Crosson et al., 2002; Elliott et al., 2000, 2002; George et al., 1995; Gundel et al., 2003; Maddock et al., 2003) whose temporal resolution is in the order of seconds, whereas neural activity related to emotional processing and behavior is in the sub-second range. The pres...

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Abstract

A method and system for determining the subjective state of mind of a human subject presented with a test audible or visual stimulus. An electroencephalogram (EEG) recording unit is connected to the human subject, recording the subject's EEG when presented with one or more test stimuli. The recorded EEG signal is then transformed to a 3-D map in order to visualize the brain areas that were active when presenting the test stimuli. The given 3-D map of the test stimuli is then compared with reference 3-D maps of neutral and subjectively significant stimuli.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method and system for determining the subjective state of mind of a human subject and in particular to assessment of neurophysiologic manifestations of subjective significance. BACKGROUND OF THE INVENTION [0002] The neural substrates of emotional response have traditionally been studied using universal sets of emotionally loaded stimuli, regardless of their subjective significance to the individual subject. Assessment of the unique brain response to subjectively significant stimuli has not been studied before. [0003] Deception is probably the best-studied mind states of all; most of the present lie-detection testing techniques use polygraph devices to examine the peripheral autonomic response to relevant versus irrelevant questions. Present day polygraph devices can combine measurements of electro-dermal skin conductance, blood pressure, respiration and peripheral vasomotor activity, minute changes in vocal response an...

Claims

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Application Information

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IPC IPC(8): A61B5/0476
CPCA61B5/0484A61B5/377
Inventor OFEK, EINATPRATT, HILLEL
Owner TECHNION RES & DEV FOUND LTD
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