ROONEY, Justice.
Appellant-defendant appeals from a judgment and sentence rendered on a jury verdict which found him guilty of burglary in violation of § 6-7-201, W.S.1977. He words the issues on appeal as follows:
1. Did the trial court err in allowing the victim to testify because his memory was refreshed during two hypnotic sessions?
2. Was defendant denied effective assistance of counsel because of the failure to adequately record the hypnotic sessions?
3. Was it reversible error for the prosecution to withhold the testimony of Max Gehring from their case in chief and to present this witness during rebuttal?
We affirm.
The victim (hereinafter referred to as witness) found an intruder in his house when he returned home from work. In the ensuing struggle, the intruder struck the witness on the hand and above the right eye with a hammer. The intruder then fled.
The witness gave a general description of the intruder after the incident. Later, the witness was hypnotized by a Thermopolis city police officer on two occasions. The witness added some details to the previously given description after each session. The reason given for the second session was that the authorities had more than one suspect that matched the description given by the witness during the first session. These sessions were videotaped; however, the tapes, for the most part, were inaudible.
Appellant, on the day of trial prior to any testimony being given, objected to the identification testimony of the witness since it was enhanced by the use of hypnosis. Appellant further asserted that the failure of the videotapes prevented effective assistance of counsel by denying effective cross-examination and by prohibiting appellant’s expert to view the procedures used by the State’s hypnotist. The court ruled that the State would not mention hypnosis during opening statements and would not present any evidence on hypnosis unless the “defendant opens the gate” on the subject of hypnosis. The State was to be restricted to witness’ identification of appellant based on what the “State contends was by reason of the episode that took place where he was assaulted.”
In its case in chief, the State presented testimony from the witness and from the investigating officer. The witness testified to the occurrences at the time of the discovery of the intruder, and he identified appellant in court as the burglar. He had previously identified him from a photographic lineup, and the investigating officer so testified.
However, in cross-examination of the witness, the appellant did “open the gate” by inquiring at length into the hypnotic sessions, and in its case in chief, appellant called the hypnotist and examined him extensively concerning such sessions. Appellant also presented evidence relative to hypnotism from his own expert witness on hypnotism. Finally, appellant presented four alibi witnesses, including himself.
In rebuttal, the State presented testimony from one who was incarcerated at the time appellant was incarcerated to the effect that appellant had made statements in the form of a confession. Appellant objected to the testimony on the ground that it should have been presented in the State’s [1282]*1282case in chief. The objection was overruled. Appellant then presented a surrebuttal witness who testified that he was present at the time the alleged statements in the form of a confession were made and that they were not, in fact, made.
TESTIMONY BY PREVIOUSLY HYPNOTIZED WITNESS1
The issue relative to the admissibility of testimony of witnesses who were previously hypnotized is whether the product of the hypnosis was to refresh or develop the witness’ own recollection or to teach the witness and add additional facts to the recollection beyond that which has been mentally stored in the memory, consciously or unconsciously. The issue is properly one for the fact finder — as are all issues relative to the credibility of the witness.
Appellant had ample opportunity to test the credibility of the previously hypnotized witness — to determine whether or not his recollection as to the identity of appellant had been enhanced by the hypnotic sessions and, if so, whether such enhancement was only to the extent of a recall of his own memory or whether it included suggested items which were not a part of his own memory. In all of this, appellant did not elicit any indication that the witness’ testimony was other than from his own recollection or that impermissible suggestions were made during the hypnotic sessions which added to that actually within the memory of the witness.
The witness had given a description of the burglar immediately after the burglary. Later, the witness was subjected to the hypnotic sessions. The witness testified that his recollection was refreshed in part thereby. Thereafter, the witness identified appellant as the burglar from a photographic lineup. He subsequently identified appellant in court as the burglar.
The jury had before it the circumstances of the identification, including the part played therein by the hypnotic sessions. Appellant’s attack on the credibility of the witness was before the jury. The success of such attack was for determination by the jury.
The majority of the states are in accord. Such testimony is allowed, leaving it to the fact finder to gauge the credibility of it on the basis of that presented to the fact finder concerning the effect of hypnotism generally and in the specific case. See Annot.: Admissibility of Hypnotic Evidence at Criminal Trial, 92 A.L.R.3d 442, § 8; Harding v. State, 5 Md.App. 230, 246 A.2d 302 (1968), cert. denied 395 U.S. 949, 89 S.Ct. 2030, 23 L.Ed.2d 468 (1969); United States v. Awkard, 597 F.2d 667 (9th Cir. 1979), cert. denied 444 U.S. 885, 100 S.Ct. 179, 62 L.Ed.2d 116 (1979); United States v. Narciso, 446 F.Supp. 252 (D.C.Mich.1977); Clark v. State, Fla.App., 379 So.2d 372 (1979); Creamer v. State, 232 Ga. 136, 205 S.E.2d 240 (1974); People v. Smrekar, 68 Ill.App.3d 379, 24 Ill.Dec. 707, 385 N.E.2d 848 (1979); People v. Hughes, 99 Misc.2d 863, 417 N.Y.S.2d 643 (1979); State v. McQueen, 295 N.C. 96, 244 S.E.2d 414 (1978); State v. Jorgensen, 8 Or.App. 1, 492 P.2d 312 (1971).
A few states have rejected testimony of a previously hypnotized witness as incompetent. They held such testimony as inadmissible per se in a criminal trial. State v. Mena, 128 Ariz. 226, 624 P.2d 1274 (1981); State v. Mack, Minn., 292 N.W.2d 764 (1980); Commonwealth v. Nazarovitch, - Pa. -, 436 A.2d 170 (1981). Although there may be considerable merit to such holding, appellant does not request that we go so far. But he does urge us to treat the issue on the basis of competency rather than credibility. He urges us to adopt the following procedural requirements set out in State v. Hurd, 86 N.J.
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ROONEY, Justice.
Appellant-defendant appeals from a judgment and sentence rendered on a jury verdict which found him guilty of burglary in violation of § 6-7-201, W.S.1977. He words the issues on appeal as follows:
1. Did the trial court err in allowing the victim to testify because his memory was refreshed during two hypnotic sessions?
2. Was defendant denied effective assistance of counsel because of the failure to adequately record the hypnotic sessions?
3. Was it reversible error for the prosecution to withhold the testimony of Max Gehring from their case in chief and to present this witness during rebuttal?
We affirm.
The victim (hereinafter referred to as witness) found an intruder in his house when he returned home from work. In the ensuing struggle, the intruder struck the witness on the hand and above the right eye with a hammer. The intruder then fled.
The witness gave a general description of the intruder after the incident. Later, the witness was hypnotized by a Thermopolis city police officer on two occasions. The witness added some details to the previously given description after each session. The reason given for the second session was that the authorities had more than one suspect that matched the description given by the witness during the first session. These sessions were videotaped; however, the tapes, for the most part, were inaudible.
Appellant, on the day of trial prior to any testimony being given, objected to the identification testimony of the witness since it was enhanced by the use of hypnosis. Appellant further asserted that the failure of the videotapes prevented effective assistance of counsel by denying effective cross-examination and by prohibiting appellant’s expert to view the procedures used by the State’s hypnotist. The court ruled that the State would not mention hypnosis during opening statements and would not present any evidence on hypnosis unless the “defendant opens the gate” on the subject of hypnosis. The State was to be restricted to witness’ identification of appellant based on what the “State contends was by reason of the episode that took place where he was assaulted.”
In its case in chief, the State presented testimony from the witness and from the investigating officer. The witness testified to the occurrences at the time of the discovery of the intruder, and he identified appellant in court as the burglar. He had previously identified him from a photographic lineup, and the investigating officer so testified.
However, in cross-examination of the witness, the appellant did “open the gate” by inquiring at length into the hypnotic sessions, and in its case in chief, appellant called the hypnotist and examined him extensively concerning such sessions. Appellant also presented evidence relative to hypnotism from his own expert witness on hypnotism. Finally, appellant presented four alibi witnesses, including himself.
In rebuttal, the State presented testimony from one who was incarcerated at the time appellant was incarcerated to the effect that appellant had made statements in the form of a confession. Appellant objected to the testimony on the ground that it should have been presented in the State’s [1282]*1282case in chief. The objection was overruled. Appellant then presented a surrebuttal witness who testified that he was present at the time the alleged statements in the form of a confession were made and that they were not, in fact, made.
TESTIMONY BY PREVIOUSLY HYPNOTIZED WITNESS1
The issue relative to the admissibility of testimony of witnesses who were previously hypnotized is whether the product of the hypnosis was to refresh or develop the witness’ own recollection or to teach the witness and add additional facts to the recollection beyond that which has been mentally stored in the memory, consciously or unconsciously. The issue is properly one for the fact finder — as are all issues relative to the credibility of the witness.
Appellant had ample opportunity to test the credibility of the previously hypnotized witness — to determine whether or not his recollection as to the identity of appellant had been enhanced by the hypnotic sessions and, if so, whether such enhancement was only to the extent of a recall of his own memory or whether it included suggested items which were not a part of his own memory. In all of this, appellant did not elicit any indication that the witness’ testimony was other than from his own recollection or that impermissible suggestions were made during the hypnotic sessions which added to that actually within the memory of the witness.
The witness had given a description of the burglar immediately after the burglary. Later, the witness was subjected to the hypnotic sessions. The witness testified that his recollection was refreshed in part thereby. Thereafter, the witness identified appellant as the burglar from a photographic lineup. He subsequently identified appellant in court as the burglar.
The jury had before it the circumstances of the identification, including the part played therein by the hypnotic sessions. Appellant’s attack on the credibility of the witness was before the jury. The success of such attack was for determination by the jury.
The majority of the states are in accord. Such testimony is allowed, leaving it to the fact finder to gauge the credibility of it on the basis of that presented to the fact finder concerning the effect of hypnotism generally and in the specific case. See Annot.: Admissibility of Hypnotic Evidence at Criminal Trial, 92 A.L.R.3d 442, § 8; Harding v. State, 5 Md.App. 230, 246 A.2d 302 (1968), cert. denied 395 U.S. 949, 89 S.Ct. 2030, 23 L.Ed.2d 468 (1969); United States v. Awkard, 597 F.2d 667 (9th Cir. 1979), cert. denied 444 U.S. 885, 100 S.Ct. 179, 62 L.Ed.2d 116 (1979); United States v. Narciso, 446 F.Supp. 252 (D.C.Mich.1977); Clark v. State, Fla.App., 379 So.2d 372 (1979); Creamer v. State, 232 Ga. 136, 205 S.E.2d 240 (1974); People v. Smrekar, 68 Ill.App.3d 379, 24 Ill.Dec. 707, 385 N.E.2d 848 (1979); People v. Hughes, 99 Misc.2d 863, 417 N.Y.S.2d 643 (1979); State v. McQueen, 295 N.C. 96, 244 S.E.2d 414 (1978); State v. Jorgensen, 8 Or.App. 1, 492 P.2d 312 (1971).
A few states have rejected testimony of a previously hypnotized witness as incompetent. They held such testimony as inadmissible per se in a criminal trial. State v. Mena, 128 Ariz. 226, 624 P.2d 1274 (1981); State v. Mack, Minn., 292 N.W.2d 764 (1980); Commonwealth v. Nazarovitch, - Pa. -, 436 A.2d 170 (1981). Although there may be considerable merit to such holding, appellant does not request that we go so far. But he does urge us to treat the issue on the basis of competency rather than credibility. He urges us to adopt the following procedural requirements set out in State v. Hurd, 86 N.J. 525, 432 A.2d 86 (1981)2 to be met and demonstrated to the court before testimony can be received from a previously hypnotized witness:
[1283]*12831. A psychiatrist or psychologist experienced in the use of hypnosis must conduct the session.
2. The professional conducting the hypnotic session should be independent of and not regularly employed by the prosecutor, investigator or defense.
3. Any information given to the hypnotist by law enforcement personnel or the defense prior to the hypnotic session must be recorded, either in writing or another suitable form.
4. Before inducing hypnosis the hypnotist should obtain from the subject a detailed description of the facts as the subject remembers them. The hypnotist should carefully avoid influencing the description by asking structured questions or adding new details.
5 All contacts between the hypnotist and the subject must be recorded.
6. Only the hypnotist and the subject should be present during any phase of the hypnotic session, including the pre-hypnotic testing and the posthypnotic interview. State v. Hurd, supra, 432 A.2d at 96-97.
The party proffering the testimony 3 of a previously hypnotized witness may well be advised to fortify the credibility of such witness by complying with some or all of these safeguards, but there are too many variables in hypnotism to mandate such requirements.
Since suggestion is a keystone to hypnosis, a form of hypnosis or attempts at hypnosis, are common in our daily lives. Advertising agencies depend upon it for their existence. Repeated suggestions of pleasant results from use of a product or service anticipates an acceptance of such and a desire to use it. Subliminal advertising messages on television4 were recognized as productive, but their use was restricted. Driving on an open road, watching the monotonous white line, listening to soothing music or to the hum of the motor can produce a form of hypnosis. Self-hypnosis is taught by psychiatrists to assist in eliminating emotional trouble, in overcoming bad habits, for relaxation, etc. Removing oneself from the real world by daydreaming is a form of hypnosis. It has been taught to some of the members of the Air Force to assist in coping with post-crash survival problems.
Conditions for bringing about a hypnotic state include concentration of attention, monotony, inhibition of stimuli, limitation of field of consciousness and limitation of voluntary movement. Under such conditions, one can induce a hypnotic state in others. An induced hypnotic state results from the hypnotist obtaining the attention of the subject and presenting to him a series of suggestive instructions to be accepted in progression from that probable to the subject to that which is improbable to him. This is usually accomplished by oral presentation of the suggestions, but it can be accomplished by physical contact, or by use of mechanical devices such as swinging pendulums, flashing mirrors, rotating disks, metronome, etc. Often the techniques are combined.
There are both quantitative and qualitative differences between subjects in the degree of their involvement in hypnosis. Some people are readily hypnotized. Some can be hypnotized, if at all, only with great difficulty. Furthermore, the hypnotic state is one of degree. Various experts have analyzed the degrees or states to be from 3 or 4 in number to 15 or 20. The degree of involvement varies from a state of drowsiness to a stage of deep somnambulism. Normally, involvement proceeds from slight to large. The involvement of some individuals is limited to the lesser degrees. There is always a potential for “role playing” or [1284]*1284simulation in which the subject seems to accept the improbable instruction, but in fact does not. It is often difficult to detect “role playing.” 5
An allowance is not made for these variables in the six-point foundation requirement. It attempts to establish a rigid and strict procedural standard to a process characterized by variables in its scope and in its application. The frailties of memory without having been subject to hypnosis could as well be said to require the suggested six-point procedural safeguards as does the memory of a previously hypnotized individual. The emphasis should be placed on credibility and not on competence.
“The common law rules of incompetency have been undergoing a process of piecemeal revision by statutes for over a century, so that today most of the former grounds for excluding a witness altogether have been converted into mere grounds of impeaching his credibility.” McCormick on Evidence (2d Ed.), § 61, p. 139. “Competence refers to the condition of the witness at the time he or she is called to testify. * * * That her present memory depends upon refreshment claimed to have been induced under hypnosis goes to the credibility of her testimony not to her competence as a witness. Although the device by which recollection was refreshed is unusual, in legal effect her situation is not different from that of a witness who claims that his recollection of an event that he could not earlier remember was revived when he thereafter read a particular document. * * * ” Kline v. Ford Motor Co., Inc., 523 F.2d 1067, 1069-1070 (9th Cir. 1975).
“We cannot accept Fairchild’s argument that Wyller’s testimony was rendered inherently untrustworthy by his having undergone hypnosis. Wyller testified from his present recollection, refreshed by the treatments. His credibility and the weight to be given such testimony were for the jury to determine. Fairchild was entitled to, and did, challenge the reliability of both the remembered facts and the hypnosis procedure itself by extensive and thorough cross-examination of Wyl-ler and the hypnotist. Under the circumstances, we perceive no abuse of discretion by the district court. See Harding v. State, 5 Md.App. 230, 246 A.2d 302, 311-312 (1968), cert. denied 395 U.S. 949, 89 S.Ct. 2030, 23 L.Ed.2d 468 (1969); State v. Jorgensen, 8 Or.App. 1, 492 P.2d 312, 315-316 (Or.App.1971).” Wyller v. Fairchild Hiller Corporation, 503 F.2d 506, 509-510 (9th Cir. 1974).
Our rules are in accord.
“Every person is competent to be a witness except as otherwise provided in these rules.” Rule 601, W.R.E.
The rules do not otherwise provide that the testimony of a previously hypnotized witness is incompetent.
“The credibility of a witness may be attacked by any party, including the party calling him.” Rule 607, W.R.E.
An attack on credibility is the proper method to determine the value of the testimony of a previously hypnotized witness. Any one or all of the six points may, or may not, have bearing on the credibility of such witness in a given use.6 But to make the six [1285]*1285points a foundation requirement to the competency of the witness is improper and unworkable.
The trial court did not err in receiving the testimony of the witness in this case.
DENIAL OF EFFECTIVE ASSISTANCE OF COUNSEL
Appellant contends that denial of effective assistance of counsel resulted from the failure to make available to him an audible videotape of the hypnotic sessions. Appellant’s contention is rejected by our holding that, although, a recording of such sessions would assist in establishing the credibility of the testimony of the witness, it is not a foundation requirement for such testimony.
However, we note that the two witnesses to the sessions took notes on them. The record does not reflect any effort by appellant to obtain or use such notes. The notes may have been sufficient for the purpose of a recording requirement. The two witnesses to the hypnotic sessions were subject to interview by appellant, and he could present their testimony. The hypnotist was examined extensively by appellant. He denied any improper factual implantation in the mind of the witness. He explained and exemplified the questions posed by him to the witness during the sessions to substantiate the method by which the memory of the witness was refreshed but not added to with suggestions.
Appellant had adequate means to determine that which transpired at the sessions. Effective assistance of counsel was not impaired.
REBUTTAL TESTIMONY
Section 7-11-201, W.S.1977, provides in pertinent part:
“(a) After the jury has been impaneled and sworn, the trial shall proceed in the following order:
* * * * * *
“(Hi) The state must first produce its evidence; the defendant will then produce his evidence;
“(iv) The state will then be confined to rebutting evidence unless the court, for good reasons, in furtherance of justice, shall permit it to offer evidence in chief.”
The reception of evidence beyond that which is strictly “rebuttal” is thus placed in the sound discretion of the trial court. Such is in accord with the general law.
“The general rules for the introduction of testimony must be so often applied or relaxed, according to circumstances apparent only to the trial court, that a strict uniformity at all times is not to be expected, and in some instances would prove unjust. Whether there shall be a departure from the usual order of proof is a matter addressed to the sound discretion of the trial court, and an appellate court will interfere only where there is an abuse of discretion. For example, the allowance of evidence to be introduced in rebuttal, which should have been offered in chief, will not be inquired into unless a clear abuse of discretion appears. It has even been said that the reception of evidence out of order is not subject to revision or exception. And failure to follow the regular order of proof has generally been held not to be reversible error unless it is prejudicial.” 75 Am.Jur.2d Trial, § 146, pp. 238-239. [1286]*1286bound to give all his evidence in support of the issue in the first instance, and will not be permitted to hold back part of his evidence confirmatory of his case and then offer it on rebuttal. Rebuttal testimony offered by the plaintiff should rebut the testimony brought out by the defendant and should consist of nothing which could have been offered in chief. And unless the court in its discretion dispenses with the requirement, the defendant, as well as the plaintiff, should introduce all his evidence in chief in support of his main case. But the trial court may, in its discretion, permit the introduction of such evidence on rebuttal, and an appellate court will not interfere except in cases of clear abuse of discretion. Nor, as a general rule, will the court on appeal interfere with the discretion of the trial court in refusing to permit evidence in chief to be introduced in rebuttal. However, where evidence is real rebuttal evidence, the fact that it could have been offered in chief does not preclude its admission in rebuttal. And where a failure of proof is not taken advantage of, the court may permit the defect to be supplied on rebuttal.” 75 Am.Jur.2d Trial, § 151, pp. 241-242.
[1285]*1285“As a general rule, the party upon whom the affirmative of an issue devolves is
[1286]*1286The evidence here in question (testimony by one incarcerated with appellant concerning statements made by appellant in the form of a confession) may have been admissible in the State’s case in chief. The trial court commented on it in terms of impeaching evidence, but it was actually accepted as part of the State’s case in chief.7 This is evidenced by the fact that appellant was allowed surrebuttal. Rule 7-ll-201(a)(iv), supra, makes such within the discretion of the trial court.
The issue here, then, is whether or not the trial court abused its discretion.
“A court does not abuse its discretion unless it acts in a manner which exceeds the bounds of reason under the circumstances. In determining whether there has been an abuse of discretion, the ultimate issue is whether or not the court could reasonably conclude as it did. An abuse of discretion has been said to mean an error of law committed by the court under the circumstances. * * * ” Martinez v. State, Wyo., 611 P.2d 831, 838 (1980).
Before making its ruling in this instance, the trial court ascertained that the identity of the witness and the nature of his testimony had been made known to appellant about one week prior to trial. The trial court advised appellant that he could have surrebuttal. The appellant had his surre-buttal witness available to contest the evidence to be given by the rebuttal witness. The surrebuttal testimony was received.
“Late in the trial, after the defense had rested, the state was permitted to introduce evidence that was properly a part of its case in chief. This was a matter within the discretion of the trial judge, and we think the discretion was not abused. Wyo.C.S.1920, § 7532, par. 4; Keffer v. State, 12 Wyo. 49, 73 P. 556; State v. Pinkston (Wyo.) 240 P. 219. There is nothing in the record to show that defendant was denied the right to meet this evidence by reopening his case, or that he was not then as well prepared to meet it as he would have been if it had been introduced in its regular order.” Strand v. State, 36 Wyo. 78, 252 P. 1030, 1032 (1927). See Janski v. State, Wyo., 538 P.2d 271 (1975).
Wyo.C.S.1920, § 7532, par. 4, referred to in the quotation is identical with § 7 — 11— 201(a)(iv), W.S.1977, supra.
Under the circumstances of this case, it cannot be said that the trial court acted in a manner which exceeded the bounds of reason. An abuse of discretion did not occur.
Affirmed.