Defendant was charged with committing two lewd and lascivious acts upon a child under the age of sixteen on or about the summer or fall of 1988, in violation of 13 V.S.A. § 2602. He was found guilty after trial by jury and appeals. We affirm.
On the basis of a single affidavit of probable cause, the State issued two informations accusing defendant of lewd and lascivious conduct with a child. The two incidents of abuse occurred at the victim’s grandmother’s house. The first took place in the bedroom, after which the victim wrote a letter to her parents reporting being raped and asking for help. The second occurred in the living room while defendant and the victim sat on the couch watching television.
Defendant requested assignment of counsel at his arraignment in January 1989. The trial court appointed counsel to represent defendant at a bail review hearing, but shortly thereafter defendant advised the court he wished to represent himself. After being informed of the complexity and gravity of the charges against him, defendant agreed to utilize court-appointed counsel on a consulting basis and signed a waiver-of-counsel form.
The court granted the State’s motion to videotape the testimony of the victim and ordered appointed counsel to appear to assist in the cross-examination of the victim. With the court’s permission, defendant left the videotaping prior to the victim’s testimony, instructing his counsel to forego cross-examination. At the next hearing, defendant reiterated his decision to represent himself and signed a second waiver-of-counsel form. Appointed counsel appeared for defendant during trial in a standby capacity, occasionally arguing motions and questioning witnesses.
At trial, the State called the investigating officer, a Department of Social and Rehabilitation Services (SRS) caseworker, and a counselor on contract with SRS. All three testified to having substantial training and experience in the area of child sexual abuse. The counselor offered testimony, which implied that the alleged abuse had in fact occurred, to explain the victim’s difficulty in talking about the incidents. The officer and the caseworker offered their opinions of the complainant’s character for truthfulness. Defendant took the stand and consistently maintained his innocence. The jury returned guilty verdicts on both counts.
*177Both a presentence investigation report (PSI) and a psycho-sexual evaluation of defendant endorsed the maximum sentence of ten years based on defendant’s extreme denial respecting his offenses. The judge sentenced defendant to consecutive terms of eighteen months to five years.
I.
Defendant’s first assignment of error is that Linda Cope, who was offered and accepted as an expert on child sexual abuse, impermissibly commented on complainant’s credibility. We agree.
Ms. Cope is a certified mental health counselor who worked under contract with SRS to provide treatment for victims of sexual abuse and their families. In this capacity she first met with complainant in April 1989. She has provided individual and group counselling to complainant since that time. The following testimony was elicited on direct examination:
Q: Miss Cope, what kind of psychological effect has the alleged abuse had on [complainant]?
A: Well, [complainant] was about eleven at the time the abuse occurred. Now she’s twelve and she’s coming into puberty. One of the things that happens to children of that age when they’re sexually abused is that it creates a great deal of shame and embarrassment because it induces trauma on the level of your developing body ....
Q: Would it be fair to say that in your opinion, the abuse is interfering with [complainant’s] development?
At this point defendant objected on the ground that the abuse was still only alleged, not proven, and should be referred to as such. The court agreed, and the questioning continued as follows:
Q: Would it be fair to say that the alleged abuse is interfering with [complainant’s] development?
A: Yes____'
Q: You mentioned [complainant] has some negative feelings about herself as a result of the alleged abuse. Could you describe those feelings to the jury?
*178A: Well, I would call them — it’s shame. It’s basically shame. She calls it embarrassment. It precludes her ability to really, really talk about it in a way that will kind of help her see the issues clearly. She has a real hesitancy to talk about it. When she began — when she made her statement originally, the social workers all had to leave the room so that she could talk into the tape-recorder to tell the incident because she was so humiliated and felt so bad about it. And even while she was in the room all by herself, with the tape-recorder she still needed to whisper into the tape-recorder. It was that kind of shameful experience.
Q: So it’s difficult for [complainant] to talk about the alleged abuse?
A: Yes.
Defendant also claims error in two additional colloquies between the prosecutor and Ms. Cope. Having stated that complainant was able to distinguish between a “good” touch and a touch of an overtly sexual nature, Ms. Cope was asked, “Does her recognition of the distinction have an impact on the degree of her traumatization?,” to which Ms. Cope responded affirmatively. When asked to give her opinion as to why complainant continued to go to her grandmother’s home “after the first incident of abuse,” even though defendant was still there, she responded:
I mean, she was caught between a rock and a hard place. She needed to get to grandmother’s, but there was also something else that was very difficult for her going on at grandmother’s.
[Complainant] told what happened to her about the sexual abuse because she needed to stop it to make Gram’s a safe place again for her.
A.
Expert testimony in a criminal child sexual abuse case is admissible to help jurors understand “the emotional antecedents of the victim’s conduct” so that they “may be better able to assess the credibility” of the victim. State v. Catsam, 148 Vt. *179366, 369, 534 A.2d 184, 187 (1987). It is improper for the expert to give testimony that is “tantamount to a direct comment that the complainant was telling the truth about the alleged sexual assault.” Id. at 370, 534 A.2d at 187. Further, it is improper for the expert to testify, on the basis of behavior exhibited by a complainant after the alleged abuse, that the complainant is a victim of sexual abuse. State v. Gokey, 154 Vt. 129, 134, 574 A.2d 766, 768 (1990). The overriding concern with expert testimony in this type of case is that the jury will perceive the expert as a “truth detector.” State v. Wetherbee, 156 Vt. 425, 431, 594 A.2d 390, 393 (1991). This infringes on a defendant’s constitutional right to a jury trial, as it invades the exclusive province of the jury to determine the credibility of witnesses. Id. at 431-32, 594 A.2d at 393; Gokey, 154 Vt. at 140, 574 A.2d at 771; Catsam, 148 Vt. at 371, 534 A.2d at 188. It is also suspect because of the substantial doubt that experts can make a reliable determination of a sexual abuse complainant’s credibility. Wetherbee, 156 Vt. at 431, 594 A.2d at 393. The fact that a complainant displays symptoms similar to those displayed by children who have been sexually abused is not usually sufficient to allow an expert to testify that that particular complainant has been sexually abused. Gokey, 154 Vt. at 134-35, 574 A.2d at 772; accord People v. Beckley, 434 Mich. 691, 722-23, 456 N.W.2d 391, 405 (1990) (evidence of child sexual abuse syndrome “is not intended as a diagnostic tool for detection of sexual abuse. Thus, it has no probative value in terms of being able to detect sexual abuse on the basis of the existence of certain behavioral characteristics.”).
This proscription is not only on direct comments, but also on testimony that is “tantamount to a direct comment.” Catsam, 148 Vt. at 370, 534 A.2d at 187; accord State v. Batangan, 71 Haw. 552, 559, 799 P.2d 48, 52 (1990) (“[W]here the effect of the expert’s opinion is ‘the same as directly opining on the truthfulness of the complaining witness,’ such testimony invades the province of the jury.”) (quoting State v. Myers, 382 N.W.2d 91, 97 (Iowa 1986)). Thus, in Catsam, the expert’s negative response to the prosecutor’s question “Do children make up stories about sexual abuse as part of the syndrome that you describe?” was held to be tantamount to a direct comment that the complainant was telling the truth. Catsam, 148 Vt. at 368, *180370, 534 A.2d at 186, 187. In Wetherbee, the expert related what the child had told him about the abuse, including the name of the abuser. 156 Vt. at 432, 594 A.2d at 393. We stated that “[although the psychologist did not explicitly voice his opinion that the victim was truthful, his testimony, when viewed in context, gave the distinct impression that he believed her.” Id. This impression of belief warranted reversal. See Gokey, 154 Vt. at 137-38, 574 A.2d at 770 (“[Expert’s] graphic retelling of the child’s description of the events, her comments about the child’s ability to distinguish truth from falsehood, and her conclusory remarks about ‘this victimization’ were all beyond the pale . . . .”).
The questions posed by the prosecutor in this case could not be answered without conveying the expert’s belief that complainant was truthful and sexual abuse had occurred. For example, the prosecutor asked, “Miss Cope, what kind of psychological effect has the alleged abuse had on [complainant]?” If Ms. Cope did not believe that sexual abuse had occurred, she simply could not have answered this question. Preceding “abuse” with “alleged” does not save the question, because once the expert testifies as to the psychological effect that has been caused, the abuse has been removed from the realm of allegation to the realm of fact. By answering the question, Ms. Cope could not help but create the impression that she believed complainant’s account of the abuse. As it was, Ms. Cope’s answer unmistakably stated that abuse had occurred: “Well, [complainant] was about eleven at the time the abuse occurred.” Ms. Cope responded affirmatively when asked “Would it be fair to say that the alleged abuse is interfering with [complainant’s] development?” Again, necessarily implicit in her answer was that she believed complainant’s account of the abuse. This is true of the other statements pointed to as erroneous by defendant. This testimony was improper.
This case demonstrates the'dangers, pointed to in Wetherbee, of attempting to explain to the jury the emotional antecedents of a child sexual abuse complainant’s conduct through expert testimony concerning the particular complainant. Wetherbee, 156 Vt. at 433, 594 A.2d at 394. See also Gokey, 154 Vt. at 138 n.6, 574 A.2d at 771 n.6 (“An obvious danger attending the use of the expert’s testimony is that throughout her interview with the *181child she assumed the truth of the allegations underlying this trial.”). The conduct of a child who has been sexually abused, and the emotional antecedents underlying this conduct, can be effectively explained to the jury through testimony relating to the class of victims in general. See State v. Hicks, 148 Vt. 459, 462, 535 A.2d 776, 777 (1987) (explaining complainant’s delay in reporting abuse through expert testimony that delay is common); see also State v. Moran, 151 Ariz. 378, 382-83, 728 P.2d 248, 252-55 (1986) (expert testimony explaining the emotional antecedents of child sexual abuse complainant’s conduct should be generalized, not particularized); People v. Roscoe, 168 Cal. App. 3d 1093, 1099, 215 Cal. Rptr. 45, 49 (1985) (expert testimony permitted to rehabilitate complainant’s credibility must be limited to discussion of victims as a class); State v. Spigarolo, 210 Conn. 359, 380, 556 A.2d 112, 123 (1989) (expressing preference for “expert testimony that seeks to demonstrate or explain in general terms the behavioral characteristics of child abuse victims”). While we have not, as yet, gone as far as these other jurisdictions in limiting particularized testimony, see Gokey, 154 Vt. at 136-37, 574 A.2d at 769-70, we have repeatedly found use of particularized testimony to be error. Expert testimony concerning the particular complainant must be approached with caution, as it too often slips into impermissible comment on the complainant’s credibility.
B.
Defendant’s objection at trial concerning omission of the word “alleged” was not sufficient to preserve defendant’s objection on appeal that Ms. Cope impermissibly commented on complainant’s credibility. “‘An objection on one ground to the trial court does not preserve a claim of error on appeal based on other grounds.’” State v. Callahan, 155 Vt. 571, 578, 587 A.2d 970, 974 (1991) (quoting In re R.L., 148 Vt. 223, 227, 531 A.2d 909, 911-12 (1987)). Accordingly, our review is limited to plain error. V.R.Cr.P. 52(b). “Plain error will be found ‘only in a rare and extraordinary case where the error is an obvious one,’ and only if the error affects substantial rights of the defendant.” State v. Ross, 152 Vt. 462, 468, 568 A.2d 335, 339 (1989) (citations omitted).
This Court has never found an expert’s impermissible comment on a child sexual abuse complainant’s credibility to be *182plain error. See, e.g., State v. Calloway, 157 Vt. 217, 222, 596 A.2d 368, 371 (1991); Ross, 152 Vt. at 467-70, 568 A.2d at 338-40; State v. Recor, 150 Vt. 40, 45-46, 549 A.2d 1382, 1386-87 (1988); State v. DeJoinville, 145 Vt. 603, 604-05, 496 A.2d 173, 174-75 (1985). When the substance of the testimony in this case is compared with that in the foregoing cases, it is difficult to conclude that plain error was committed here. In DeJoinville, no plain error was found despite the fact that the expert expressly testified about the credibility of child sexual abuse complainants. 145 Vt. at 604, 496 A.2d at 174. In Recor, the expert stated that the consistency of a child’s statements “gives me a sense that what they are saying happened, happened.” 150 Vt. at 45, 549 A.2d at 1386. In Ross, the expert not only detailed the complainant’s sexual activity with the defendant as told to her by the complainant, and not only stated that young children do not fabricate stories of sexual abuse, but also expressly concluded that the complainant had been sexually abused by the defendant. 152 Vt. at 467-68, 568 A.2d at 339. In Calloway, this Court denied defendant a new trial despite the fact that the expert stated on cross-examination that “[c]hildren who make accusations of sexual abuse are generally telling the truth.” 157 Vt. at 221, 596 A.2d at 371.
Here, the prosecution did not elicit expert testimony for the improper purpose of commenting on complainant’s credibility or stating that abuse had occurred. The error in Ms. Cope’s testimony lay solely in the manner in which it was adduced. The prosecutor’s questions and Ms. Cope’s answers implicitly assumed the truth of complainant’s account of the abuse. While conveying the implicit assumption to the jury was error, this did not, especially in light of the purpose for which the testimony was adduced, amount to plain error. Ms. Cope’s testimony constituted only eleven of the over two hundred transcript pages of trial testimony, five of which were devoted to qualifying her as an expert. Further, the parties did not repeat or emphasize her testimony to the jury during closing arguments. The lack of emphasis is a proper consideration in finding no plain error. See State v. Bubar, 146 Vt. 398, 401, 505 A.2d 1197, 1199 (1985).
We conclude that Ms. Cope’s testimony was not plain error.
*183c.
Defendant also objects to testimony by Officer Whipple and SRS caseworker Diane Dexter, who both testified to specialized training and experience in the area of child sexual abuse. Defendant made no objection, which limits our analysis to plain error. Defendant takes issue with Officer Whipple’s testimony that when he first met with defendant, he told him that he believed complainant and not defendant. The trial court sua sponte intervened at that point, expressed its concern with Officer Whipple testifying as to believability, and instructed the jury to disregard the testimony for that purpose. We find no plain error requiring reversal. See Calloway, 157 Vt. at 222, 596 A.2d at 372 (immediate curative instruction a factor in finding no plain error). Nor do we find plain error in Ms. Dexter’s explanation that complainant was placed in a foster home because her parents failed to protect her by allowing her to go to the grandmother’s house “where the incidents had occurred.”
Defendant’s more substantial contention is that the prosecutor committed plain error by eliciting opinions from these two witnesses, under V.R.E. 608, that complainant’s character was truthful after her character for truthfulness had been attacked. We agree that Rule 608 opinions by witnesses such as these must be approached with caution.
First, we recognize that where a witness knows a complainant only through the case at trial, the witness’s opinion that the complainant has a truthful character is tantamount to an opinion that the complainant’s allegations in the case are true. It is no longer an opinion as to the complainant’s character for truthfulness, but is an opinion as to the complainant’s truthfulness on this occasion. If this is so, the witness’s opinion should be prohibited for failing to meet the foundational requirements of Rule 608. See United States v. Dotson, 799 F.2d 189, 193-94 (5th Cir. 1986) (excluding government agents’ Fed. R. Evid. 608 opinions as to defendant’s character for untruthfulness where only basis for opinions was their criminal investigation of defendant), discussed with approval in 3 J. Weinstein & M. Berger, Weinstein’s Evidence ¶ 608[04], at 608-26 (1988).
Second, even if the foundational requirements are met, opinions as to a complainant’s character for truthfulness by witnesses such as these are dangerous because such opinions are *184too easily taken for expert comment on the credibility of the complainant’s allegations.' Where the witnesses have testified to specialized training and experience in the area of child sexual abuse, and have applied this training to the case being heard, it is difficult to avoid the impression that their opinions as to a complainant’s character for truthfulness are expert opinions as to the truthfulness of the complainant’s allegations. This impression can violate the spirit of Catsam and its progeny, and should be avoided.
Defendant did not, however, object to admission of these opinions, and we cannot conclude that their admission was plain error. The foundational bases for the witnesses’ opinions were left unexplored precisely because no objection was made. Defendant should not be able to capitalize on this failure, and we will not consider the opinions erroneous because foundational bases were not demonstrated. Further, we do not consider the infringement on Catsam and its progeny to be so obvious as to constitute plain error.
II.
A.
Defendant also argues that the two informations, supported by a single affidavit, violated his state and federal constitutional rights to fair notice of the charges against him. Defendant did not object below to the sufficiency of the informations. “If the sufficiency of an indictment or information is not questioned at the trial, the pleading must be held sufficient unless it is so defective that it does not, by any reasonable construction, charge an offense for which the defendant is convicted ____” 1 C. Wright, Federal Practice and Procedure § 123, at 354-55 (2d ed. 1982) (footnote omitted); see State v. Francis, 151 Vt. 296, 308-10, 561 A.2d 392, 399-400 (1989) (applying plain error analysis to sufficiency of information where no objection was made below). This inquiry is not answered, as the State seems to contend, by the fact that defendant subjectively understood the informations. It is an objective inquiry. State v. Phillips, 142 Vt. 283, 288-89, 455 A.2d 325, 328 (1982). In determining the sufficiency of the informations, we do not read them in isolation. We consider the informations together with the ac*185companying affidavit of probable cause. State v. Stanislaw, 153 Vt. 517, 526, 573 A.2d 286, 291 (1990); State v. Christman, 135 Vt. 59, 61, 370 A.2d 624, 626 (1977). We cannot conclude, under an objective inquiry, that the informations read together with the affidavit were so defective that they did not, by any reasonable construction, give adequate notice of the charged offenses for which defendant was convicted.
B.
Defendant argues that the court erred in failing to require the presence of standby counsel at certain pretrial hearings. Defendant was represented by appointed counsel until he insisted on proceeding pro se because, in his words, “I don’t really feel that there’s anybody really qualified to represent me as well as I can myself.” Defendant did state, in response to the court’s warnings about the complicated nature of criminal defense, that “as far as the ins and outs of the system is concerned, it may be good for me to be able to counsel with someone as far as knowing which moves to make and which' moves not to make.” The court gave defendant the option of having counsel sit in on hearings to assist him. Defendant responded: “If we could take that kind of one step at a time. I’m not certain if that’s something that I’d like to have done or not but it would probably be good to have that option open.” The court then made the following accommodation: “If at anytime you wish to have [counsel] sit in for any hearing, then I would suggest that you just simply give him a call and I’m going to ask [counsel] in that instance to come to court.” Defendant never availed himself of this option and did not have counsel present with him in court until the videotaping of complainant’s testimony and trial.
“A criminal defendant does not have an absolute right to both self-representation and the assistance of counsel. Whether to allow hybrid representation remains within the sound discretion of the trial judge.” United States v. Halbert, 640 F.2d 1000, 1009 (9th Cir. 1981). “[I]f the district court ha[s] discretion to deny hybrid representation outright, it ha[s] discretion, in granting defendant’s request for hybrid representation, to place reasonable limitations and conditions upon the arrangement.” United States v. Nivica, 887 F.2d 1110, 1121 (1st *186Cir. 1989). We will reverse a trial court’s discretionary decision only if its discretion was totally withheld or exercised on grounds clearly untenable or unreasonable. State v. Dorn, 145 Vt. 606, 616, 496 A.2d 451, 457 (1985). We cannot conclude that the arrangement created by the court, allowing counsel to attend the hearings should defendant request his presence, was an abuse of discretion. This was a reasonable accommodation of defendant’s rights to self-representation and assistance of counsel: Further, the record indicates that defendant was in communication with this counsel. Defendant stated that he consulted with counsel “from time to time,” and that “he’s been real good.” The court did not err.
C.
Defendant argues that a core aspect of his right of self-representation — the right “to question witnesses,” McKaskle v. Wiggins, 465 U.S. 168, 174 (1984) — was abridged by the requirement that defendant ask his questions of complainant through an attorney. Defendant’s argument fails because he consistently disavowed any intent to question complainant. When the court asked defendant whether he was willing to have an attorney question complainant, defendant responded:
[The prosecutor] has implied that we had an interest in cross-examining [complainant], and it was pointed out very clearly in April that we had no such intention, and it’s been mentioned most recently that we have no intention of questioning [complainant]. We have no questions to ask her whatsoever. . . .
What I’m saying is, I don’t have any interest in questioning [complainant]. I never have had any interest in questioning [complainant].
The court had to order defendant to appear at the taking of complainant’s testimony, and he left prior to his opportunity for cross-examination. Defendant’s right “to question witnesses” was not violated. Further, insofar as the right of self-representation encompasses “the jury’s perception that the defendant is representing himself,” id. at 178, this perception was not infringed upon here. Counsel did not intrude on this perception *187because he declined to conduct any cross-examination of complainant, stating that defendant was appearing pro se and he was “going to respect [defendant’s] directions.”
Because of this factual background we need not, and do not, reach the issue of whether requiring a pro se defendant to ask questions of a minor victim through the voice of standby counsel is constitutional error. We do note, however, that the one relevant decision to date rejects such an argument. State v. Taylor, 562 A.2d 445, 454 (R.I. 1989); cf. V.R.E. 807(d) (“Only the court and the attorneys for the defendant and for the state may question the child. In pro se proceedings, the court may modify the provisions of this subsection relating to the role of the attorney for the defendant.”).
D.
Defendant argues, in the alternative, that appointed counsel was ineffective because he did not cross-examine complainant. When offered the opportunity to cross-examine, counsel stated:
I’ve been instructed by my client not to cross-examine, and it’s my understanding that he is still appearing pro se in this matter, that I am at this deposition to protect his rights. But based upon the fact that he is pro se, consequently his own counsel of record, I am going to respect his directions to me and not cross-examine [complainant] at this time.
“The pro se defendant must be allowed to control the organization and content of his own defense____” McKaskle, 465 U.S. at 174. Counsel acceded to defendant’s express choice not to cross-examine complainant. Such accedence may have been constitutionally required, and certainly is not a valid basis for objection.
E.
Defendant’s final contention is that the court’s consideration, at sentencing, of defendant’s continued denial of his crime impermissibly penalized his constitutional privilege against self-incrimination. Both the presentence investigation report and a psychosexual evaluation found that defendant was in “an extreme degree of denial with respect to his offense.” Defendant *188objected to consideration of his denial, asserting that “I haven’t acknowledged doing anything wrong from the beginning and I’m not about to acknowledge doing anything wrong today. I’m concerned about the ... State using the sentencing process as a lever to extort a confession.” The sentencing court considered
the degree to which the defendant is willing to acknowledge whatever particular antisocial habits or drives that he or she may have, such that there’s some belief that the person is amenable to some treatment so that the same kind of events are not going to happen in the future.
The court felt that probation would not be useful for defendant in his present state of denial because “[t]here’s absolutely no reason to believe that [he would] function in any way on probation other than to continue [his] manipulative denial.” The prosecutor testified that if defendant discontinued his denial and admitted the nature of his offense, three years would still be necessary to effectuate sex offender treatment. Defendant received consecutive sentences of eighteen months to five years on the two counts.
While we have not previously considered whether a defendant’s denial of guilt during the presentence phase may be considered at sentencing, in State v. Noyes, 157 Vt. 114, 119, 596 A.2d 340, 342 (1991), we held that the sentencing court may consider the testimony and demeanor of the defendant during trial. Once a guilty verdict is reached, over a defendant’s insistence of innocence, the court may take “defendant’s lying into account.” Id. at 119, 596 A.2d at 343. In the present case, defendant actively maintained his innocence throughout the trial and the presentence investigation. Whether we label his statements as “lying” or “denial,” the sentencing court may properly consider a defendant’s refusal to acknowledge his crimes. We discern no reason for that court to distinguish between denial expressed at trial and denial expressed during the presentence phase.
A defendant’s acceptance of responsibility for the offense, and a sincere demonstration of remorse, are proper considerations in sentencing. They constitute important steps toward rehabilitation. Where they are present, a reduction in sentence can be appropriate. Likewise, denying this reduction, *189where there are no acknowledgements, can be appropriate and does not penalize a defendant’s privilege against self-incrimination. We ‘“are unprepared to equate the possibility of leniency with impermissible punishment.’” United States v. Parker, 903 F.2d 91, 105 (2d Cir. 1990) (quoting United States v. Henry, 883 F.2d 1010, 1011 (11th Cir. 1989) (per curiam)); accord United States v. Gonzalez, 897 F.2d 1018, 1021 (9th Cir. 1990). If we were to characterize the denial of a reduction as a penalty, it “would be to say that defendants who express genuine remorse for their actions can never be rewarded at sentencing. This the Constitution does not require.” Henry, 883 F.2d at 1012. See also Brady v. United States, 397 U.S. 742, 753 (1970) (not unconstitutional to extend a benefit to defendant who demonstrates a willingness to accept rehabilitation). Defendant has not demonstrated that the court did anything other than deny him a reduction, and, accordingly, there was no violation of his privilege against self-incrimination.
Affirmed.