Improved calibration of color video projectors by means of computer animation

A computer animation for the calibration of color video projectors is described. The animation facilitates the calibration procedure and can be readily programmed on almost any graphics computer or played from a videotape.     

RTbox: A device for highly accurate response time measurements

Although computer keyboards and mice are frequently used in measuring response times (RTs), the accuracy of these measurements is quite low. Specialized RT collection devices must be used to obtain more accurate measurements. However, all the existing devices have some shortcomings. We have developed and implemented a new, commercially available device, the RTbox, for highly accurate RT measurements. The RTbox has its own microprocessor and high-resolution clock. It can record the identities and timing of button events with high accuracy, unaffected by potential timing uncertainty or biases during data transmission and processing in the host computer. It stores button events until the host computer chooses to retrieve them. The asynchronous storage greatly simplifies the design of user programs. The RTbox can also receive and record external signals as triggers and can measure RTs with respect to external events. The internal clock of the RTbox can be synchronized with the computer clock, so the device can be used without external triggers. A simple USB connection is sufficient to integrate the RTbox with any standard computer and operating system.     

Can computer mice be used as low-cost devices for the acquisition of planar human movement velocity signals?

The main goal of this work is to determine whether a computer mouse can be used as a low-cost device for the acquisition of two-dimensional human movement velocity signals in the context of psychophysical studies and biomedical applications. A comprehensive overview of the related literature is presented, and the problem of characterizing mouse movement acquisition is analyzed and discussed. Then, the quality of velocity signals acquired with this kind of device is measured on horizontal oscillatory movements by comparing the mouse data to the signals acquired simultaneously by a video motion tracking system and a digitizing tablet. A synthesis of the information gathered in this work indicates that the computer mouse can be used for the reliable acquisition of biosignals in the context of human movement studies, particularly for many applications dealing with the velocity of the end effector of the upper limb. This paper concludes by discussing the possibilities and limitations of such use.     

Memory Bias in Recovered Clinical Depressives

Abstract

Emotions can be regarded as the manifestations of a system that realises multiple concerns and operates in an uncertain environment. Taking the concern realisation function as a starting point, it is argued that the major phenomena of emotion follow from considerations of what properties a subsystem implementing that function should have. The major phenomena are: the existence of the feelings of pleasure and pain, the importance of cognitive or appraisal variables, the presence of innate, pre-programmed behaviours as well as of complex constructed plans for achieving emotion goals, and the occurrence of behavioural interruption, disturbance and impulse-like priority of emotional goals. The system properties underlying these phenomena are facilities for relevance detection of events with regard to the multiple concerns, availability of relevance signals that can be recognised by the action system, and facilities for control precedence, or flexible goal priority ordering and shift.

A computer program, ACRES, is described that is built upon the specifications provided by this emotion theory. It operates in an operator-machine interaction involving the task of executing a knowledge manipulation task (the knowledge domain happens to be about emotions). ACRES responds emotionally when one of his concerns (e.g. errorless input, being kept busy, receiving varied input, not being killed) is touched upon. Responses are social signals, shifts in resource allocations to the operator, interruption of current task-directed processing, and refusal to accept instructions. His flow of behaviour shows much of the preference-based predictability, response interference, goalshifts, and social signalling of human and animal emotional behaviour.     

Gender stereotypes, aggression, and computer games: an online survey of women.

Computer games were conceptualized as a potential mode of entry into computer-related employment for women. Computer games contain increasing levels of realism and violence, as well as biased gender portrayals. It has been suggested that aggressive personality characteristics attract people to aggressive video games, and that more women do not play computer games because they are socialized to be non-aggressive. To explore gender identity and aggressive personality in the context of computers, an online survey was conducted on women who played computer games and women who used the computer but did not play computer games. Women who played computer games perceived their online environments as less friendly but experienced less sexual harassment online, were more aggressive themselves, and did not differ in gender identity, degree of sex role stereotyping, or acceptance of sexual violence when compared to women who used the computer but did not play video games. Finally, computer gaming was associated with decreased participation in computer-related employment; however, women with high masculine gender identities were more likely to use computers at work.     

SPLIT: A sound editor for a PDP-8 computer

SPLIT is a program that helps prepare sounds for use in psychological experiments. Analog signals are converted to digital form and stored on a disk in real time. Digital sound files can be viewed on an oscilloscope display and played back for on-line auditory inspection. Interactive commands allow the user to segment and combine sounds with precise temporal control.     

The SYBAR system: Integrated recording and display of video, EMG, and force plate data

A new system—called SYBAR—is introduced, that employs digital video for registration of the movements of a patient while simultaneously recording electromyogram signals of relevant muscles and ground reaction forces (for the lower extremities in gait studies). All information is stored in a multimedia record, which can be viewed by the clinician with a simple user interface. This setup allows an integrated and more detailed view of the movement of the patient and related information (i.e., muscle physiology). It is used by clinicians to assess the causes of movement disorders in their patients. This paper describes the SYBAR system and focuses on the employed methods of data synchronization for both the time and the spatial domains. It is concluded that, although SYBAR was developed for clinical gait studies, the technology can be applied in all situations in which the relation between physiological signals and human or animal behavior is studied.     

Comparing choices and variations in people and rats: Two teaching experiments

Two pairs of experiments enabled students to compare their own operant behaviors with those of rats. The students played computer games for points, and the rats pressed levers for food. The first pair of experiments showed that, under concurrent schedules of reinforcement, relative frequencies of choices between two alternatives increased linearly in rats and people as functions of relative frequencies of reinforcement, with similar biases and undermatching observed in both species. The second pair of experiments showed that behavioral variability was controlled by reinforcers contingent on variability, this again true for both species. These experiments helped demonstrate the relevance of animal operant research to an explanation of human operant behavior.     

Submerged electrodes in an aquarium: Validation of a technique for remote sensing of behavior

Necturus maculosus has been selected as representative of a class of neotenic amphibia whose behavior (including gill beat, heartbeat, and tail waving) can be sensed remotely by submerged electrodes in an aquarium. This communication presents a validation of the technique as a preface to reports on the electrophysiology of behavior in unrestrained surgically naive salamanders. Although the sources of the submarine signals are not known with certainty, they apparently depend on two factors: (1) aquarium water of appropriate ionic strength serves as a volume conductor for activity, and (2) animal movement displaces water or produces waves which are sensed as a change in potential at the water-electrode interface. This method provides a continuous comprehensive record of behavior simultaneously from several response systems in a freely behaving animal.     

Agonistic screams in wild chimpanzees (Pan troglodytes schweinfurthii) vary as a function of social role

Some nonhuman primates have demonstrated the capacity to communicate about external objects or events, suggesting primate vocalizations can function as referential signals. However, there is little convincing evidence for functionally referential communication in any great ape species. Here, the authors demonstrate that wild chimpanzees (Pan troglodytes schweinfurthii) of Budongo forest, Uganda, give acoustically distinct screams during agonistic interactions depending on the role they play in a conflict. The authors analyzed the acoustic structure of screams of 14 individuals, in the role of both aggressor and victim. The authors found consistent differences in the acoustic structure of the screams, across individuals, depending on the social role the individual played during the conflict. The authors propose that these 2 distinct scream variants, produced by victims and aggressors during agonistic interactions, may be promising candidates for functioning as referential signals.     

Compatible Dynamical Models of Environmental,Sensory, and Perceptual Systems

ABSTRACT

One of the cornerstones of the ecological stance in psychology is the compatibility, or symmetry, between animal and environment. In this article, it is argued that a first principles reevaluation of the dynamical systems that structure the information signals animals live through is an important step in understanding how compatibility is possible. What is especially important is how environmental properties are encoded by dynamical laws into the information signals of the environment and how these signals can reveal environmental properties. It is argued that that compatibility is not just 2-way compatibility between animal and environment but also 3-way compatibility of environmental, sensory, and perceptual systems. The argument is illustrated using a conceptual exegesis of 2 dynamical systems, Newtonian mechanics and Webster's acoustic horn equation. The discussion of the latter equation is accompanied by the extraction of articulatory information from speech signals of 50 speakers. It is believed that the work presented here further develops the theory of ecological psychology as well as its specific application to speech perception pioneered by Carol Fowler.     

Wildcat World: Simulation programs for teaching basic concepts in psychological science

A series of computer programs is described that allows beginning psychology students to design, conduct, analyze, and interpret virtual (computer-simulated) psychological studies. This technique allows the instructor more control over the outcome of student experiments, increases the scope of experiments that can be done by students, decreases the amount of class time that must be devoted to conducting experiments, and eliminates concerns about student experimenters using human or animal subjects.     

Computer program to generate operant schedules

A computer program for programming schedules of reinforcement is described. Students can use the program to experience schedules of reinforcement that are typically used with nonhuman subjects. A cumulative recording of a student’s responding can be shown on the screen and/or printed with the computer’s printer. The program can also be used to program operant schedules for animal subjects. The program was tested with human subjects experiencing fixed ratio, variable ratio, fixed interval, and variable interval schedules. Performance for human subjects on a given schedule was similar to performance for nonhuman subjects on the same schedule.     

Hardware debugging for on-line psychologists

As computers become more prevalent as laboratory equipment, psychologists and graduate assistants will be more likely to be involved with interfacing the experiment to the computer. This paper presents some general ideas about the design and construction of digital computer interfaces and ways to facilitate their check-out and integration into the computer system. The suggestions center around the identification of functional modules within the interface or device from the beginning of the design process. These modules are preserved in the design and construction and are tested separately where possible. Specification of the interface signals between these functional units speeds debugging of a new device and facilitates maintenance of the device at a later date if adequately documented. It is important to ensure that these signals are readily available through test points and/or indicators. The paper suggests minimal equipment necessary to construct and debug an interface. It is suggested that an interactive construction procedure may be the most successful. The device is constructed in stages, with each part being verified as it is built, A simple interface is suggested for the beginner which gives him practice and a useful debugging aid as well.     

Infrared touch technology as a response detector in animal research

The construction of a computerized research system is described. Stimuli are presented to a pigeon on a color television monitor. Pecks at the television screen are detected by a network of multiplexed infrared emitters and detectors; the coordinates of the peck are transmitted to the host computer. Computer graphics allows the experimenter to simultaneously present a variety of forms and colors as stimuli. The system accommodates innovative research methodology in animal cognition, animal psychophysics, comparative psychology, and other research interests. With modification, the system can be used with other species, including humans.     

Facial expressions and speech acts: experimental evidences on the role of the upper face as an illocutionary force indicating device in language comprehension

Language scientists have broadly addressed the problem of explaining how language users recognize the kind of speech act performed by a speaker uttering a sentence in a particular context. They have done so by investigating the role played by the illocutionary force indicating devices (IFIDs), i.e., all linguistic elements that indicate the illocutionary force of an utterance. The present work takes a first step in the direction of an experimental investigation of non-verbal IFIDs because it investigates the role played by facial expressions and, in particular, of upper-face action units (AUs) in the comprehension of three basic types of illocutionary force: assertions, questions, and orders. The results from a pilot experiment on production and two comprehension experiments showed that (1) certain upper-face AUs seem to constitute non-verbal signals that contribute to the understanding of the illocutionary force of questions and orders; (2) assertions are not expected to be marked by any upper-face AU; (3) some upper-face AUs can be associated, with different degrees of compatibility, with both questions and orders.     

Automated analyses of circadian rhythm activity of small arthropods

An automated apparatus is described which measures circadian activity rhythms of small invertebrates in darkness or in the presence of monochromatic light. Back-and-forth activity in tilt cages is measured without physical contact by magnet-activated reed switches. Four such cages are grouped around a mercury pen lamp, whose spectra lines can be selectively filtered, and all are placed in a large enclosure with light-baffling for complete control of intensity and color, delivered to each animal. Activity, measured as reed-switch closures, is counted digitally and punched out periodically onto paper tape. An interactive computer program reads, stores, plots, and further analyzes the data.     

An MS-DOS-compatible data logger for recording subjects’ self-ratings

Some research designs require subjects to make ratings of their own internal cognitive or affective states or the behavior of other subjects. An ideal device for this purpose should allow for electronic data storage and be easy to use for research subjects. The communication box (Markman & Poltrock, 1982) has been popular for this purpose but consists of dated technology. Other data-logging devices are too complicated for subjects’ use. This paper describes an electronic data logger which uses readily available hardware. A dual-tone multiple-frequency (DTMF) telephone keypad encoder is used to generate unique tones that are stored on the audio track of a videotape or on an audio tape. A DTMF receiver decoder IC is used to decode the audio signals. The decoded signals can be read on a light-emitting diode display or entered directly into a personal computer file via an RS-232 serial interface.     

Heterospecific eavesdropping on disturbance cues of a treefrog

Animal Cognition - Alarm signals and cues are crucial to animal survival and vary greatly across species. Eavesdropping on heterospecific alarm signals and cues can provide eavesdroppers with...